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w in (-oo:+oo)
-131 = 7*w+7*w-5 // - 7*w+7*w-5
5-(7*w)-(7*w)-131 = 0
5-7*w-7*w-131 = 0
-14*w-126 = 0 // + 126
-14*w = 126 // : -14
w = 126/(-14)
w = -9
w = -9
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