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w in (-oo:+oo)
3*w+4 = 6*w-23 // - 6*w-23
3*w-(6*w)+4+23 = 0
3*w-6*w+4+23 = 0
27-3*w = 0 // - 27
-3*w = -27 // : -3
w = -27/(-3)
w = 9
w = 9
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