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b in (-oo:+oo)
5*(1*b-1) = -45 // + 45
5*(1*b-1)+45 = 0
5*(b-1)+45 = 0
5*(b-1)+45 = 0
5*b+40 = 0
5*b+40 = 0
5*b+40 = 0 // - 40
5*b = -40 // : 5
b = -40/5
b = -8
b = -8
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