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w in (-oo:+oo)
2-w = 6*w-12 // - 6*w-12
2-w-(6*w)+12 = 0
2-w-6*w+12 = 0
14-7*w = 0 // - 14
-7*w = -14 // : -7
w = -14/(-7)
w = 2
w = 2
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