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b in (-oo:+oo)
2*b-1 = 4*b+23 // - 4*b+23
2*b-(4*b)-23-1 = 0
2*b-4*b-23-1 = 0
-2*b-24 = 0 // + 24
-2*b = 24 // : -2
b = 24/(-2)
b = -12
b = -12
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