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w in (-oo:+oo)
2-6*w = 6*w+14 // - 6*w+14
2-6*w-(6*w)-14 = 0
2-6*w-6*w-14 = 0
-12*w-12 = 0 // + 12
-12*w = 12 // : -12
w = 12/(-12)
w = -1
w = -1
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