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