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w in (-oo:+oo)
(3/4)*w+1/2 = 13/2 // - 13/2
(3/4)*w+1/2-(13/2) = 0
(3/4)*w+1/2-13/2 = 0
3/4*w-6 = 0 // + 6
3/4*w = 6 // : 3/4
w = 6/3/4
w = 8
w = 8
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