Question

Use complete sentences to describe why it is necessary to do the same thing to both sides of an equation to perform valid operations.

Answer 1

Because what you do to one side of the problem you must to do to the other side to have equal sides.

Answer 2

An equation normally contains an equality sign which signify that both sides of the equation is the same. If an operation is performed on one side then the same has to be done to the other side of the equation to keep them equal.