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w in (-oo:+oo)
5-w = 7*w-51 // - 7*w-51
5-w-(7*w)+51 = 0
5-w-7*w+51 = 0
56-8*w = 0 // - 56
-8*w = -56 // : -8
w = -56/(-8)
w = 7
w = 7
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