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w in (-oo:+oo)
(1/2)*w+7 = 2*w-2 // - 2*w-2
(1/2)*w-(2*w)+2+7 = 0
(1/2)*w-2*w+2+7 = 0
9-3/2*w = 0 // - 9
-3/2*w = -9 // : -3/2
w = -9/(-3/2)
w = 6
w = 6
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