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w in (-oo:+oo)
1-4*w = 2*w-23 // - 2*w-23
1-4*w-(2*w)+23 = 0
1-4*w-2*w+23 = 0
24-6*w = 0 // - 24
-6*w = -24 // : -6
w = -24/(-6)
w = 4
w = 4
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