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b in (-oo:+oo)
4*b+1 = 7*b-26 // - 7*b-26
4*b-(7*b)+1+26 = 0
4*b-7*b+1+26 = 0
27-3*b = 0 // - 27
-3*b = -27 // : -3
b = -27/(-3)
b = 9
b = 9
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