diff --git a/tokenizer.py b/tokenizer.py
index 71c276e..1468910 100644
--- a/tokenizer.py
+++ b/tokenizer.py
@@ -27,19 +27,14 @@ def get_tokens_from_expression_string(expression_string):
 		
 		elif c == '-' and not parsing_number:
 			if expression_string[i + 1] == '.' or expression_string[i + 1].isdigit():
-				if token.TokenType.get_operator(tokens[-1].value) == token.TokenType.unknown:#tokens[-1].type == token.TokenType
-					print(tokens[-1].value)
-					tokens.append(token.Token('+', token.TokenType.add))
+				if token.TokenType.get_operator(tokens[-1].value) != token.TokenType.unknown:#tokens[-1].type == token.TokenType
+					#print(tokens[-1].value)
+					#tokens.append(token.Token('+', token.TokenType.add))
 					parsing_number = True
 					tmp = "-"
-				'''if  tokens[-1].type == token.TokenType.exp_end:
-					tokens.append(token.Token(c, token.TokenType.get_operator(c)))
-					parsing_number = False
-					tmp = ""
-				else:
-					#tokens.append(token.Token('+', token.TokenType.add))
+				elif tokens[-1].type == token.TokenType.exp_start:
+					parsing_number = True
 					tmp = "-"
-					parsing_number = True'''
 			else:
 				tokens.append(token.Token(c, token.TokenType.get_operator(c)))
 				parsing_number = False