Question

If the solution of an equation is x=-2 what could the original equation be?

Answer 1

it could be 2x=-4
but the possibilities are infinite

Answer 2

It could be any equivalent equation. My guess is, you have a list of answer choices to choose from.

Answer 3

If that's the case, substitute 2 in place of x for each given equation, then evaluate.

For example, suppose 2x = -4 is one of the possibilities. Then substituting -2 for x:
2(-2) = -4
-4 = -4 True