added result declaration for new_exponent=1 for simplify_exponential_function

src/main/py/read_math_function.py

@@ -85,3 +85,5 @@ def simplify_exponential_function(type, function):
     new_exponent = exponent - 1
     if new_exponent == 0:
         result = [str(new_coefficient)]
+    elif new_exponent == 1:
+        result = [f"{new_coefficient}x"]