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w in (-oo:+oo)
3*w-(6*w)+6 = -12 // + 12
3*w-(6*w)+6+12 = 0
3*w-6*w+6+12 = 0
18-3*w = 0 // - 18
-3*w = -18 // : -3
w = -18/(-3)
w = 6
w = 6
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