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w in (-oo:+oo)
72 = 2*w+6*w+8 // - 2*w+6*w+8
72-(2*w)-(6*w)-8 = 0
72-2*w-6*w-8 = 0
64-8*w = 0 // - 64
-8*w = -64 // : -8
w = -64/(-8)
w = 8
w = 8
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