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w in (-oo:+oo)
6*w+4 = 160-7*w // - 160-7*w
6*w-(-7*w)-160+4 = 0
6*w+7*w-160+4 = 0
13*w-156 = 0 // + 156
13*w = 156 // : 13
w = 156/13
w = 12
w = 12
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