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w in (-oo:+oo)
9-4*w = 7*w-46 // - 7*w-46
9-4*w-(7*w)+46 = 0
9-4*w-7*w+46 = 0
55-11*w = 0 // - 55
-11*w = -55 // : -11
w = -55/(-11)
w = 5
w = 5
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