[Python] Is there a way to extract a variable from an equation?

I am trying to make an algebraic calculator using python, with an output like so:

eg1. x=1, x+5
eg2. x=6+12

So far my code looks like so:

def algebraic_calculator():
variables = {}
while True:
user_input = input("Enter expression (or 'quit' to exit): ").strip()
if user_input.lower() == 'quit':
break
try:
if '=' in user_input:
# Handle assignment like x=1 or x=6+12
var, expr = user_input.split('=')
var = var.strip()
expr = expr.strip()
variables[var] = eval(expr, {}, variables)
print(f"{var} = {variables[var]}")
else:
# Evaluate expression using stored variables
result = eval(user_input, {}, variables)
print(f"Result: {result}")
except Exception as e:
print(f"Error: {e}")

algebraic_calculator()


However, this does not work properly. How would I fix it?

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