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b in (-oo:+oo)
-b-(5*b)-1 = -25 // + 25
25-b-(5*b)-1 = 0
25-b-5*b-1 = 0
24-6*b = 0 // - 24
-6*b = -24 // : -6
b = -24/(-6)
b = 4
b = 4
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