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w in (-oo:+oo)
1-(2*w) = 6*w-79 // - 6*w-79
1-(2*w)-(6*w)+79 = 0
1-2*w-6*w+79 = 0
80-8*w = 0 // - 80
-8*w = -80 // : -8
w = -80/(-8)
w = 10
w = 10
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