Question

Add. Use models if needed. (-3x - 7) + (4x + 7)

Answer 1

(-3x-7)+(4x+7) = -3x-7+4x+7 = -3x+4x = x

Answer 2

-3x-7+4x+7

Negative -7 and positive 7 will give you 0.

So we're left with x. Therefore, the answer is x.