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w in (-oo:+oo)
(-5/6)*w+1/2 = 2*w+9 // - 2*w+9
(-5/6)*w-(2*w)+1/2-9 = 0
(-5/6)*w-2*w+1/2-9 = 0
-17/6*w-17/2 = 0 // + 17/2
-17/6*w = 17/2 // : -17/6
w = 17/2/(-17/6)
w = -3
w = -3
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