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w in (-oo:+oo)
3*w-4 = 6*w-34 // - 6*w-34
3*w-(6*w)-4+34 = 0
3*w-6*w-4+34 = 0
30-3*w = 0 // - 30
-3*w = -30 // : -3
w = -30/(-3)
w = 10
w = 10
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