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w in (-oo:+oo)
5*w-(7*w)+4 = -18 // + 18
5*w-(7*w)+4+18 = 0
5*w-7*w+4+18 = 0
22-2*w = 0 // - 22
-2*w = -22 // : -2
w = -22/(-2)
w = 11
w = 11
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