Description: Learn how to spot mistakes in someone else's work as they attempt to solve one-step equations. Carly tried to solve an equation step by step. Then on the left hand side she divides it by a and on the right hand side she divides by 7. Or if she wants to divide the right side by 7, she should divide the left side by 7 as well, but she's dividing both sides by two different things.*Teacher Advisor is 100% free.