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w in (-oo:+oo)
w+7 = 7*w-11 // - 7*w-11
w-(7*w)+7+11 = 0
w-7*w+7+11 = 0
18-6*w = 0 // - 18
-6*w = -18 // : -6
w = -18/(-6)
w = 3
w = 3
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