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