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w in (-oo:+oo)
5/6-((1/2)*w) = 4*w-(17/12) // - 4*w-(17/12)
5/6-((1/2)*w)-(4*w)+17/12 = 0
(-1/2)*w-4*w+5/6+17/12 = 0
9/4-9/2*w = 0 // - 9/4
-9/2*w = -9/4 // : -9/2
w = -9/4/(-9/2)
w = 1/2
w = 1/2
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