Update solver.py

solver.py

@@ -2,7 +2,7 @@ import sympy as sp
 from sympy.parsing.sympy_parser import parse_expr, standard_transformations, implicit_multiplication_application
 from sympy.solvers import solve
 from sympy import integrate, diff, simplify, expand, log, exp, sin, cos, tan, asin, acos, atan, Symbol, factorial, laplace_transform
-
+import re
 def format_expression(expr):
     """Format expression to make it more readable."""
     # Convert string representation to a more readable format
@@ -34,6 +34,8 @@ def preprocess_equation(equation_str):
         }
         for old, new in replacements.items():
             equation_str = equation_str.replace(old, new)
+            
+        equation_str = re.sub(r'(\d+)!', r'factorial(\1)', equation_str)
 
         # Handle exponential expressions
         if 'exp' in equation_str: