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b in (-oo:+oo)
4*b-1 = 6*b-25 // - 6*b-25
4*b-(6*b)-1+25 = 0
4*b-6*b-1+25 = 0
24-2*b = 0 // - 24
-2*b = -24 // : -2
b = -24/(-2)
b = 12
b = 12
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