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w in (-oo:+oo)
(1/2)*w+7*w-5 = 95/2 // - 95/2
(1/2)*w+7*w-(95/2)-5 = 0
(1/2)*w+7*w-95/2-5 = 0
15/2*w-105/2 = 0 // + 105/2
15/2*w = 105/2 // : 15/2
w = 105/2/15/2
w = 7
w = 7
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