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w in (-oo:+oo)
(1/2)*w+5 = 17/2 // - 17/2
(1/2)*w-(17/2)+5 = 0
(1/2)*w-17/2+5 = 0
1/2*w-7/2 = 0 // + 7/2
1/2*w = 7/2 // : 1/2
w = 7/2/1/2
w = 7
w = 7
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