This is a straightforward problem. You will be given an incorrect mathematical sum expression like $A+B=C$. It has to be changed and printed so that it becomes a correct mathematical sum expression like $A'+B'=C'$. But the condition is, $A+B+C$ and $A'+B'+C'$ have to be equal.
This is a companion discussion topic for the original entry at https://toph.co/p/incorrect-is-incorrect