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how do i do this equation ? -158=-2x+ 2(7x -7) . thank you

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-158=-2x+ 2(7x -7)

-158 = -2x + 14x -14

-144 = 12x

-12 = x

-158 = -2x + 14x - 14
-158 = 12x - 14
-158 +14 = 12x - 14 +14
-144 = 12x
x = -12

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