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w in (-oo:+oo)
6*(1*w+7) = 60 // - 60
6*(1*w+7)-60 = 0
6*(w+7)-60 = 0
6*(w+7)-60 = 0
6*w-18 = 0
6*w-18 = 0
6*w-18 = 0 // + 18
6*w = 18 // : 6
w = 18/6
w = 3
w = 3
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