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w in (-oo:+oo)
3*w+4 = 6*w-20 // - 6*w-20
3*w-(6*w)+4+20 = 0
3*w-6*w+4+20 = 0
24-3*w = 0 // - 24
-3*w = -24 // : -3
w = -24/(-3)
w = 8
w = 8
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