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w in (-oo:+oo)
8-w = 5*w-34 // - 5*w-34
8-w-(5*w)+34 = 0
8-w-5*w+34 = 0
42-6*w = 0 // - 42
-6*w = -42 // : -6
w = -42/(-6)
w = 7
w = 7
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