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w in (-oo:+oo)
2*w-2 = 88-7*w // - 88-7*w
2*w-(-7*w)-88-2 = 0
2*w+7*w-88-2 = 0
9*w-90 = 0 // + 90
9*w = 90 // : 9
w = 90/9
w = 10
w = 10
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