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w in (-oo:+oo)
6*w-(3*w)+6 = -18 // + 18
6*w-(3*w)+6+18 = 0
6*w-3*w+6+18 = 0
3*w+24 = 0 // - 24
3*w = -24 // : 3
w = -24/3
w = -8
w = -8
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