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w in (-oo:+oo)
5*w+4 = 7*w-14 // - 7*w-14
5*w-(7*w)+4+14 = 0
5*w-7*w+4+14 = 0
18-2*w = 0 // - 18
-2*w = -18 // : -2
w = -18/(-2)
w = 9
w = 9
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