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w in (-oo:+oo)
(1/2)*w+5 = 43/8 // - 43/8
(1/2)*w-(43/8)+5 = 0
(1/2)*w-43/8+5 = 0
1/2*w-3/8 = 0 // + 3/8
1/2*w = 3/8 // : 1/2
w = 3/8/1/2
w = 3/4
w = 3/4
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