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w in (-oo:+oo)
5*(w+7) = 55 // - 55
5*(w+7)-55 = 0
5*(w+7)-55 = 0
5*w-20 = 0
5*w-20 = 0
5*w-20 = 0 // + 20
5*w = 20 // : 5
w = 20/5
w = 4
w = 4
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