Choose the answer that best explains why we have the following rule for solving equations: “Whatever you do to one side, you must do to the other." A. We are given two values that are equal. Therefore, we need to keep them equal by doing the same thing to both sides.

B. It helps us to solve the equation and keeps stuff balanced.

C. It keeps us from having to do mental math when we solve equations and will make it easier to do harder ones in the future.

D. It will ensure that the variable is isolated in the end.