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w in (-oo:+oo)
80 = 5*w+w+8 // - 5*w+w+8
80-(5*w)-w-8 = 0
80-5*w-w-8 = 0
72-6*w = 0 // - 72
-6*w = -72 // : -6
w = -72/(-6)
w = 12
w = 12
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