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w in (-oo:+oo)
8 = 2*w+7*w+7/6+6/2 // - 2*w+7*w+7/6+6/2
8-(2*w)-(7*w)-(7/6)-(6/2) = 0
8-2*w-7*w-7/6-3 = 0
23/6-9*w = 0 // - 23/6
-9*w = -23/6 // : -9
w = -23/6/(-9)
w = 23/54
w = 23/54
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