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w in (-oo:+oo)
3*w-1/2 = 4*w-(7/6) // - 4*w-(7/6)
3*w-(4*w)-1/2+7/6 = 0
3*w-4*w-1/2+7/6 = 0
2/3-w = 0 // - 2/3
-w = -2/3 // * -1
w = 2/3
w = 2/3
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