diff --git a/src/Parser/Parsing/Impl/AbstractLexer.h b/src/Parser/Parsing/Impl/AbstractLexer.h
index 4fc22002..3f8911e7 100644
--- a/src/Parser/Parsing/Impl/AbstractLexer.h
+++ b/src/Parser/Parsing/Impl/AbstractLexer.h
@@ -259,13 +259,15 @@ protected:
         return floatingPointValue;
     }
 
-    void ReadNumber(bool& isFloatingPoint, double& floatingPointValue, int& integerValue)
+    void ReadNumber(bool& isFloatingPoint, bool& hasSignPrefix, double& floatingPointValue, int& integerValue)
     {
         const auto& currentLine = CurrentLine();
         assert(m_current_line_offset >= 1);
         assert(isdigit(currentLine.m_line[m_current_line_offset - 1])
             || currentLine.m_line[m_current_line_offset - 1] == '.'
+            || currentLine.m_line[m_current_line_offset - 1] == '+'
             || currentLine.m_line[m_current_line_offset - 1] == '-');
+        hasSignPrefix = currentLine.m_line[m_current_line_offset - 1] == '+' || currentLine.m_line[m_current_line_offset - 1] == '-';
 
         const auto lineLength = currentLine.m_line.size();
         if (lineLength - m_current_line_offset >= 1
@@ -341,9 +343,12 @@ public:
     {
         for (const auto& line : m_line_cache)
         {
-            if (*line.m_filename == pos.m_filename.get()
+            if (line.m_filename
+                && *line.m_filename == pos.m_filename.get()
                 && line.m_line_number == pos.m_line)
+            {
                 return line;
+            }
         }
 
         return ParserLine();
diff --git a/src/Parser/Parsing/Simple/Expression/SimpleExpressionMatchers.cpp b/src/Parser/Parsing/Simple/Expression/SimpleExpressionMatchers.cpp
index 1c87d2cf..dae82f95 100644
--- a/src/Parser/Parsing/Simple/Expression/SimpleExpressionMatchers.cpp
+++ b/src/Parser/Parsing/Simple/Expression/SimpleExpressionMatchers.cpp
@@ -1,5 +1,6 @@
 #include "SimpleExpressionMatchers.h"
 
+#include <algorithm>
 #include <list>
 
 #include "SimpleExpressionConditionalOperator.h"
@@ -273,6 +274,30 @@ std::unique_ptr<SimpleExpressionMatchers::matcher_t> SimpleExpressionMatchers::P
         }
     }
 
+    const auto hasAddOperation = std::any_of(enabledBinaryOperations.begin(), enabledBinaryOperations.end(), [](const SimpleExpressionBinaryOperationType* type)
+    {
+        return type == &SimpleExpressionBinaryOperationType::OPERATION_ADD;
+    });
+    const auto hasSubtractOperation = std::any_of(enabledBinaryOperations.begin(), enabledBinaryOperations.end(), [](const SimpleExpressionBinaryOperationType* type)
+    {
+        return type == &SimpleExpressionBinaryOperationType::OPERATION_SUBTRACT;
+    });
+
+    if (hasAddOperation && hasSubtractOperation)
+    {
+        binaryOperationsMatchers.emplace_back(
+            create.Or({
+                      create.IntegerWithSign(),
+                      create.FloatingPointWithSign()
+                  })
+                  .NoConsume()
+                  .Transform([](const SimpleMatcherFactory::token_list_t& values)
+                  {
+                      return SimpleParserValue::Integer(values[0].get().GetPos(), static_cast<int>(SimpleBinaryOperationId::ADD));
+                  }));
+    }
+
+
     return create.Or(std::move(binaryOperationsMatchers)).Capture(CAPTURE_BINARY_OPERATION_TYPE);
 }
 
diff --git a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.cpp b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.cpp
index 5c5a881b..4d062e32 100644
--- a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.cpp
+++ b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.cpp
@@ -7,6 +7,7 @@
 #include "SimpleMatcherKeywordPrefix.h"
 #include "SimpleMatcherMultiCharacter.h"
 #include "SimpleMatcherValueType.h"
+#include "SimpleMatcherValueTypeAndHasSignPrefix.h"
 
 SimpleMatcherFactory::SimpleMatcherFactory(const IMatcherForLabelSupplier<SimpleParserValue>* labelSupplier)
     : AbstractMatcherFactory(labelSupplier)
@@ -48,11 +49,21 @@ MatcherFactoryWrapper<SimpleParserValue> SimpleMatcherFactory::Integer() const
     return MatcherFactoryWrapper<SimpleParserValue>(std::make_unique<SimpleMatcherValueType>(SimpleParserValueType::INTEGER));
 }
 
+MatcherFactoryWrapper<SimpleParserValue> SimpleMatcherFactory::IntegerWithSign() const
+{
+    return MatcherFactoryWrapper<SimpleParserValue>(std::make_unique<SimpleMatcherValueTypeAndHasSignPrefix>(SimpleParserValueType::INTEGER, true));
+}
+
 MatcherFactoryWrapper<SimpleParserValue> SimpleMatcherFactory::FloatingPoint() const
 {
     return MatcherFactoryWrapper<SimpleParserValue>(std::make_unique<SimpleMatcherValueType>(SimpleParserValueType::FLOATING_POINT));
 }
 
+MatcherFactoryWrapper<SimpleParserValue> SimpleMatcherFactory::FloatingPointWithSign() const
+{
+    return MatcherFactoryWrapper<SimpleParserValue>(std::make_unique<SimpleMatcherValueTypeAndHasSignPrefix>(SimpleParserValueType::FLOATING_POINT, true));
+}
+
 MatcherFactoryWrapper<SimpleParserValue> SimpleMatcherFactory::Char(char c) const
 {
     return MatcherFactoryWrapper<SimpleParserValue>(std::make_unique<SimpleMatcherCharacter>(c));
diff --git a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.h b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.h
index c5a801f5..5831a4fc 100644
--- a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.h
+++ b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherFactory.h
@@ -17,7 +17,9 @@ public:
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> Identifier() const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> String() const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> Integer() const;
+    _NODISCARD MatcherFactoryWrapper<SimpleParserValue> IntegerWithSign() const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> FloatingPoint() const;
+    _NODISCARD MatcherFactoryWrapper<SimpleParserValue> FloatingPointWithSign() const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> Char(char c) const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> MultiChar(int multiCharacterSequenceId) const;
     _NODISCARD MatcherFactoryWrapper<SimpleParserValue> AnyCharBesides(std::vector<char> chars) const;
diff --git a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasPrefix.cpp b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasPrefix.cpp
new file mode 100644
index 00000000..4378a0e4
--- /dev/null
+++ b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasPrefix.cpp
@@ -0,0 +1,15 @@
+#include "SimpleMatcherValueTypeAndHasSignPrefix.h"
+
+SimpleMatcherValueTypeAndHasSignPrefix::SimpleMatcherValueTypeAndHasSignPrefix(const SimpleParserValueType type, bool hasSignPrefix)
+    : m_type(type),
+      m_has_sign_prefix(hasSignPrefix)
+{
+}
+
+MatcherResult<SimpleParserValue> SimpleMatcherValueTypeAndHasSignPrefix::CanMatch(ILexer<SimpleParserValue>* lexer, const unsigned tokenOffset)
+{
+    const auto& token = lexer->GetToken(tokenOffset);
+    return token.m_type == m_type && token.m_has_sign_prefix == m_has_sign_prefix
+               ? MatcherResult<SimpleParserValue>::Match(1)
+               : MatcherResult<SimpleParserValue>::NoMatch();
+}
diff --git a/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasSignPrefix.h b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasSignPrefix.h
new file mode 100644
index 00000000..b5564a9c
--- /dev/null
+++ b/src/Parser/Parsing/Simple/Matcher/SimpleMatcherValueTypeAndHasSignPrefix.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include "Parsing/Simple/SimpleParserValue.h"
+#include "Parsing/Matcher/AbstractMatcher.h"
+
+class SimpleMatcherValueTypeAndHasSignPrefix final : public AbstractMatcher<SimpleParserValue>
+{
+    SimpleParserValueType m_type;
+    bool m_has_sign_prefix;
+
+protected:
+    MatcherResult<SimpleParserValue> CanMatch(ILexer<SimpleParserValue>* lexer, unsigned tokenOffset) override;
+
+public:
+    explicit SimpleMatcherValueTypeAndHasSignPrefix(SimpleParserValueType type, bool hasSignPrefix);
+};
diff --git a/src/Parser/Parsing/Simple/SimpleLexer.cpp b/src/Parser/Parsing/Simple/SimpleLexer.cpp
index e95b098b..bb862a37 100644
--- a/src/Parser/Parsing/Simple/SimpleLexer.cpp
+++ b/src/Parser/Parsing/Simple/SimpleLexer.cpp
@@ -120,18 +120,19 @@ SimpleParserValue SimpleLexer::GetNextToken()
     if (m_config.m_read_strings && c == '\"')
         return SimpleParserValue::String(pos, new std::string(ReadString()));
 
-    if (m_config.m_read_numbers && (isdigit(c) || (c == '-' || c == '.') && isdigit(PeekChar())))
+    if (m_config.m_read_numbers && (isdigit(c) || (c == '+' || c == '-' || c == '.') && isdigit(PeekChar())))
     {
         bool isFloatingPointValue;
+        bool hasSignPrefix;
         double doubleValue;
         int integerValue;
 
-        ReadNumber(isFloatingPointValue, doubleValue, integerValue);
+        ReadNumber(isFloatingPointValue, hasSignPrefix, doubleValue, integerValue);
 
         if (isFloatingPointValue)
-            return SimpleParserValue::FloatingPoint(pos, doubleValue);
+            return SimpleParserValue::FloatingPoint(pos, doubleValue, hasSignPrefix);
 
-        return SimpleParserValue::Integer(pos, integerValue);
+        return SimpleParserValue::Integer(pos, integerValue, hasSignPrefix);
     }
 
     if (isalpha(c) || c == '_')
diff --git a/src/Parser/Parsing/Simple/SimpleParserValue.cpp b/src/Parser/Parsing/Simple/SimpleParserValue.cpp
index 51be28c9..3acdac5f 100644
--- a/src/Parser/Parsing/Simple/SimpleParserValue.cpp
+++ b/src/Parser/Parsing/Simple/SimpleParserValue.cpp
@@ -41,6 +41,14 @@ SimpleParserValue SimpleParserValue::Integer(const TokenPos pos, const int value
     return pv;
 }
 
+SimpleParserValue SimpleParserValue::Integer(const TokenPos pos, const int value, const bool hasSignPrefix)
+{
+    SimpleParserValue pv(pos, SimpleParserValueType::INTEGER);
+    pv.m_value.int_value = value;
+    pv.m_has_sign_prefix = hasSignPrefix;
+    return pv;
+}
+
 SimpleParserValue SimpleParserValue::FloatingPoint(const TokenPos pos, const double value)
 {
     SimpleParserValue pv(pos, SimpleParserValueType::FLOATING_POINT);
@@ -48,6 +56,14 @@ SimpleParserValue SimpleParserValue::FloatingPoint(const TokenPos pos, const dou
     return pv;
 }
 
+SimpleParserValue SimpleParserValue::FloatingPoint(const TokenPos pos, const double value, const bool hasSignPrefix)
+{
+    SimpleParserValue pv(pos, SimpleParserValueType::FLOATING_POINT);
+    pv.m_value.double_value = value;
+    pv.m_has_sign_prefix = hasSignPrefix;
+    return pv;
+}
+
 SimpleParserValue SimpleParserValue::String(const TokenPos pos, std::string* stringValue)
 {
     SimpleParserValue pv(pos, SimpleParserValueType::STRING);
@@ -67,6 +83,7 @@ SimpleParserValue::SimpleParserValue(const TokenPos pos, const SimpleParserValue
     : m_pos(pos),
       m_type(type),
       m_hash(0),
+      m_has_sign_prefix(false),
       m_value{}
 {
 }
@@ -91,6 +108,7 @@ SimpleParserValue::SimpleParserValue(SimpleParserValue&& other) noexcept
     : m_pos(other.m_pos),
       m_type(other.m_type),
       m_hash(other.m_hash),
+      m_has_sign_prefix(other.m_has_sign_prefix),
       m_value(other.m_value)
 {
     other.m_value = ValueType();
@@ -102,6 +120,7 @@ SimpleParserValue& SimpleParserValue::operator=(SimpleParserValue&& other) noexc
     m_type = other.m_type;
     m_value = other.m_value;
     m_hash = other.m_hash;
+    m_has_sign_prefix = other.m_has_sign_prefix;
     other.m_value = ValueType();
 
     return *this;
diff --git a/src/Parser/Parsing/Simple/SimpleParserValue.h b/src/Parser/Parsing/Simple/SimpleParserValue.h
index 520294f0..79cd3d40 100644
--- a/src/Parser/Parsing/Simple/SimpleParserValue.h
+++ b/src/Parser/Parsing/Simple/SimpleParserValue.h
@@ -33,6 +33,7 @@ public:
     TokenPos m_pos;
     SimpleParserValueType m_type;
     size_t m_hash;
+    bool m_has_sign_prefix;
     union ValueType
     {
         char char_value;
@@ -48,7 +49,9 @@ public:
     static SimpleParserValue Character(TokenPos pos, char c);
     static SimpleParserValue MultiCharacter(TokenPos pos, int multiCharacterSequenceId);
     static SimpleParserValue Integer(TokenPos pos, int value);
+    static SimpleParserValue Integer(TokenPos pos, int value, bool hasSignPrefix);
     static SimpleParserValue FloatingPoint(TokenPos pos, double value);
+    static SimpleParserValue FloatingPoint(TokenPos pos, double value, bool hasSignPrefix);
     static SimpleParserValue String(TokenPos pos, std::string* stringValue);
     static SimpleParserValue Identifier(TokenPos pos, std::string* identifier);
 
diff --git a/src/ZoneCodeGeneratorLib/Parsing/Commands/Impl/CommandsLexer.cpp b/src/ZoneCodeGeneratorLib/Parsing/Commands/Impl/CommandsLexer.cpp
index 99d66933..97ec0b7a 100644
--- a/src/ZoneCodeGeneratorLib/Parsing/Commands/Impl/CommandsLexer.cpp
+++ b/src/ZoneCodeGeneratorLib/Parsing/Commands/Impl/CommandsLexer.cpp
@@ -119,10 +119,11 @@ CommandsParserValue CommandsLexer::GetNextToken()
             if (isdigit(c))
             {
                 bool isFloatingPointValue;
+                bool hasSignPrefix;
                 double doubleValue;
                 int integerValue;
 
-                ReadNumber(isFloatingPointValue, doubleValue, integerValue);
+                ReadNumber(isFloatingPointValue, hasSignPrefix, doubleValue, integerValue);
 
                 if (isFloatingPointValue)
                     return CommandsParserValue::FloatingPoint(pos, doubleValue);
diff --git a/src/ZoneCodeGeneratorLib/Parsing/Header/Impl/HeaderLexer.cpp b/src/ZoneCodeGeneratorLib/Parsing/Header/Impl/HeaderLexer.cpp
index b2a70215..ff4dd034 100644
--- a/src/ZoneCodeGeneratorLib/Parsing/Header/Impl/HeaderLexer.cpp
+++ b/src/ZoneCodeGeneratorLib/Parsing/Header/Impl/HeaderLexer.cpp
@@ -138,10 +138,11 @@ HeaderParserValue HeaderLexer::GetNextToken()
                 if(isdigit(c))
                 {
                     bool isFloatingPointValue;
+                    bool hasSignPrefix;
                     double doubleValue;
                     int integerValue;
 
-                    ReadNumber(isFloatingPointValue, doubleValue, integerValue);
+                    ReadNumber(isFloatingPointValue, hasSignPrefix, doubleValue, integerValue);
 
                     if (isFloatingPointValue)
                         return HeaderParserValue::FloatingPoint(pos, doubleValue);
diff --git a/test/ParserTests/Parsing/Simple/SimpleExpressionTests.cpp b/test/ParserTests/Parsing/Simple/SimpleExpressionTests.cpp
index ce35b69a..8eaec2e8 100644
--- a/test/ParserTests/Parsing/Simple/SimpleExpressionTests.cpp
+++ b/test/ParserTests/Parsing/Simple/SimpleExpressionTests.cpp
@@ -1,6 +1,9 @@
 #include <catch2/catch.hpp>
 
+#include <sstream>
+
 #include "Parsing/Impl/AbstractParser.h"
+#include "Parsing/Impl/ParserSingleInputStream.h"
 #include "Utils/ClassUtils.h"
 #include "Parsing/Mock/MockLexer.h"
 #include "Parsing/Simple/SimpleParserValue.h"
@@ -33,22 +36,54 @@ namespace test::parsing::simple::expression
     protected:
         void ProcessMatch(SimpleExpressionTestState* state, SequenceResult<SimpleParserValue>& result) const override
         {
+            if (state->m_expression)
+                throw ParsingException(TokenPos(), "Expression already set");
+
             state->m_expression = m_expression_matchers.ProcessExpression(result);
         }
     };
 
+    class SimpleExpressionParser final : public AbstractParser<SimpleParserValue, SimpleExpressionTestState>
+    {
+    public:
+        explicit SimpleExpressionParser(ILexer<SimpleParserValue>* lexer)
+            : AbstractParser(lexer, std::make_unique<SimpleExpressionTestState>())
+        {
+        }
+
+        _NODISCARD SimpleExpressionTestState* GetState() const
+        {
+            return m_state.get();
+        }
+
+    protected:
+        const std::vector<sequence_t*>& GetTestsForState() override
+        {
+            static std::vector<sequence_t*> tests({
+                new SimpleExpressionSequence()
+            });
+
+            return tests;
+        }
+    };
+
     class SimpleExpressionTestsHelper
     {
     public:
-        std::unique_ptr<SimpleExpressionTestState> m_state;
+        SimpleExpressionTestState* m_state;
+        std::unique_ptr<SimpleExpressionTestState> m_state_holder;
+        std::string m_str;
+        std::istringstream m_ss;
+        std::unique_ptr<IParserLineStream> m_stream;
         std::unique_ptr<ILexer<SimpleParserValue>> m_lexer;
+        std::unique_ptr<SimpleExpressionParser> m_parser;
 
         std::unique_ptr<SimpleExpressionSequence> m_sequence;
 
         unsigned m_consumed_token_count;
 
-        explicit SimpleExpressionTestsHelper()
-            : m_state(std::make_unique<SimpleExpressionTestState>()),
+        SimpleExpressionTestsHelper()
+            : m_state(nullptr),
               m_sequence(std::make_unique<SimpleExpressionSequence>()),
               m_consumed_token_count(0u)
         {
@@ -56,20 +91,48 @@ namespace test::parsing::simple::expression
 
         void Tokens(std::initializer_list<Movable<SimpleParserValue>> tokens)
         {
+            m_state_holder = std::make_unique<SimpleExpressionTestState>();
+            m_state = m_state_holder.get();
             m_lexer = std::make_unique<MockLexer<SimpleParserValue>>(tokens, SimpleParserValue::EndOfFile(TokenPos()));
         }
 
         void Tokens(std::vector<SimpleParserValue> tokens)
         {
+            m_state_holder = std::make_unique<SimpleExpressionTestState>();
+            m_state = m_state_holder.get();
             m_lexer = std::make_unique<MockLexer<SimpleParserValue>>(std::move(tokens), SimpleParserValue::EndOfFile(TokenPos()));
         }
 
+        void String(std::string str)
+        {
+            m_str = std::move(str);
+            m_ss = std::istringstream(m_str);
+            m_stream = std::make_unique<ParserSingleInputStream>(m_ss, "InputString");
+
+            SimpleLexer::Config lexerConfig;
+            lexerConfig.m_read_strings = true;
+            lexerConfig.m_read_numbers = true;
+            lexerConfig.m_emit_new_line_tokens = false;
+            SimpleExpressionMatchers(true, true, true, true, true).ApplyTokensToLexerConfig(lexerConfig);
+            m_lexer = std::make_unique<SimpleLexer>(m_stream.get(), std::move(lexerConfig));
+            m_parser = std::make_unique<SimpleExpressionParser>(m_lexer.get());
+            m_state = m_parser->GetState();
+        }
+
         bool PerformTest()
         {
             REQUIRE(m_lexer);
 
             m_consumed_token_count = 0;
-            return m_sequence->MatchSequence(m_lexer.get(), m_state.get(), m_consumed_token_count);
+            return m_sequence->MatchSequence(m_lexer.get(), m_state, m_consumed_token_count);
+        }
+
+        _NODISCARD bool PerformIntegrationTest() const
+        {
+            REQUIRE(m_lexer);
+            REQUIRE(m_parser);
+
+            return m_parser->Parse();
         }
     };
 
@@ -738,4 +801,41 @@ namespace test::parsing::simple::expression
         REQUIRE(value.m_type == SimpleExpressionValue::Type::INT);
         REQUIRE(value.m_int_value == 1337);
     }
+
+    namespace it
+    {
+        TEST_CASE("SimpleExpressionsIT: Can parse subtraction without space", "[parsing][simple][expression][it]")
+        {
+            SimpleExpressionTestsHelper helper;
+            helper.String("6-5");
+
+            const auto result = helper.PerformIntegrationTest();
+
+            REQUIRE(result);
+
+            const auto& expression = helper.m_state->m_expression;
+            REQUIRE(expression->IsStatic());
+
+            const auto value = expression->Evaluate();
+            REQUIRE(value.m_type == SimpleExpressionValue::Type::INT);
+            REQUIRE(value.m_int_value == 1);
+        }
+
+        TEST_CASE("SimpleExpressionsIT: Can parse addition without space", "[parsing][simple][expression][it]")
+        {
+            SimpleExpressionTestsHelper helper;
+            helper.String("6+5");
+
+            const auto result = helper.PerformIntegrationTest();
+
+            REQUIRE(result);
+
+            const auto& expression = helper.m_state->m_expression;
+            REQUIRE(expression->IsStatic());
+
+            const auto value = expression->Evaluate();
+            REQUIRE(value.m_type == SimpleExpressionValue::Type::INT);
+            REQUIRE(value.m_int_value == 11);
+        }
+    }
 }