diff --git a/src/main/py/read_math_function.py b/src/main/py/read_math_function.py
index f0bf97f..ecbd18e 100644
--- a/src/main/py/read_math_function.py
+++ b/src/main/py/read_math_function.py
@@ -125,4 +125,6 @@ def sum_of_simplified_exponential_functions(type, function):
 def difference_of_simplified_exponential_functions(type, function):
     if type !="de":
         return False
-    minuend, subtrahend = function.split('-')
\ No newline at end of file
+    minuend, subtrahend = function.split('-')
+    new_minuend = simplify_exponential_function('e', minuend)
+    new_subtrahend = simplify_exponential_function('e', subtrahend)
\ No newline at end of file