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w in (-oo:+oo)
w-2 = 78-7*w // - 78-7*w
w-(-7*w)-78-2 = 0
w+7*w-78-2 = 0
8*w-80 = 0 // + 80
8*w = 80 // : 8
w = 80/8
w = 10
w = 10
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