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w in (-oo:+oo)
2*w-1 = 6*w+47 // - 6*w+47
2*w-(6*w)-47-1 = 0
2*w-6*w-47-1 = 0
-4*w-48 = 0 // + 48
-4*w = 48 // : -4
w = 48/(-4)
w = -12
w = -12
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