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w in (-oo:+oo)
80 = 3*w+5*w-8 // - 3*w+5*w-8
8-(3*w)-(5*w)+80 = 0
8-3*w-5*w+80 = 0
88-8*w = 0 // - 88
-8*w = -88 // : -8
w = -88/(-8)
w = 11
w = 11
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