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w in (-oo:+oo)
17/72 = (-1/2)*w-((2/3)*w)+5/8 // - (-1/2)*w-((2/3)*w)+5/8
(2/3)*w-((-1/2)*w)+17/72-(5/8) = 0
(1/2)*w+(2/3)*w+17/72-5/8 = 0
7/6*w-7/18 = 0 // + 7/18
7/6*w = 7/18 // : 7/6
w = 7/18/7/6
w = 1/3
w = 1/3
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