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b in (-oo:+oo)
5*b+1 = 7*b-23 // - 7*b-23
5*b-(7*b)+1+23 = 0
5*b-7*b+1+23 = 0
24-2*b = 0 // - 24
-2*b = -24 // : -2
b = -24/(-2)
b = 12
b = 12
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