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w in (-oo:+oo)
(-1/2)*(4*w+6) = (1/3)*(9-(3*w)) // - (1/3)*(9-(3*w))
(-1/2)*(4*w+6)-((1/3)*(9-(3*w))) = 0
(-1/2)*(4*w+6)+(-1/3)*(9-3*w) = 0
-1/2*(4*w+6)-1/3*(9-3*w) = 0
-1/2*(4*w+6)-1/3*(9-3*w) = 0
-w-6 = 0
-w-6 = 0
-w-6 = 0 // + 6
-w = 6 // * -1
w = -6
w = -6
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