13 = 7 + s
(13 - 7) = (7-7) + s
6 = s
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Set up the equation and solve: 13 = 7 + s (next subtract 7 from each side of the equation to solve for s) 6 = s
no it;s not the answer is 2
the x's are -7's
9s + 7 = -11 9s = -18 s = -18/9 s = -2
s = -70