Distributive Law Exercise shows incorrect despite correct expression

[EskAlam06]

I was solving the exercise Apply The Distributive Law to (21+3*36/4-3)*5.

I entered the following expression:-

215+336/45-35

According to instructions , the expression is correct but it's still shows incorrect due to parenthesis use.

Even though I don't want to use parenthesis , the expression controller automatically puts it into a parenthesis.

Steps-

1. Enter The Distributive Law Exercise
2. Enter the expression above for the question
3. Submit answer

Expected Behavior: The expression should be correct

Actual Behavior:

The expression is incorrect due to the expression controller automatically puts it into a parenthesis

Screenshots-