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w in (-oo:+oo)
8-(4*w)-w = -12 // + 12
8-(4*w)-w+12 = 0
8-4*w-w+12 = 0
20-5*w = 0 // - 20
-5*w = -20 // : -5
w = -20/(-5)
w = 4
w = 4
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