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w in (-oo:+oo)
2*(3*w-6) = -36 // + 36
2*(3*w-6)+36 = 0
2*(3*w-6)+36 = 0
6*w+24 = 0
6*w+24 = 0
6*w+24 = 0 // - 24
6*w = -24 // : 6
w = -24/6
w = -4
w = -4
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