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b in (-oo:+oo)
5*(1*b-1) = 20 // - 20
5*(1*b-1)-20 = 0
5*(b-1)-20 = 0
5*(b-1)-20 = 0
5*b-25 = 0
5*b-25 = 0
5*b-25 = 0 // + 25
5*b = 25 // : 5
b = 25/5
b = 5
b = 5
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