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w in (-oo:+oo)
43/18 = 6*w+7*w-(1/2) // - 6*w+7*w-(1/2)
43/18-(6*w)-(7*w)+1/2 = 0
43/18-6*w-7*w+1/2 = 0
26/9-13*w = 0 // - 26/9
-13*w = -26/9 // : -13
w = -26/9/(-13)
w = 2/9
w = 2/9
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