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w in (-oo:+oo)
9-(2*w) = 6*w-47 // - 6*w-47
9-(2*w)-(6*w)+47 = 0
9-2*w-6*w+47 = 0
56-8*w = 0 // - 56
-8*w = -56 // : -8
w = -56/(-8)
w = 7
w = 7
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