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w in (-oo:+oo)
(3/4)*w-((1/2)*w)-4 = 13 // - 13
(3/4)*w-((1/2)*w)-13-4 = 0
(3/4)*w+(-1/2)*w-13-4 = 0
1/4*w-17 = 0 // + 17
1/4*w = 17 // : 1/4
w = 17/1/4
w = 68
w = 68
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