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b in (-oo:+oo)
5*(b+8) = 25 // - 25
5*(b+8)-25 = 0
5*(b+8)-25 = 0
5*b+15 = 0
5*b+15 = 0
5*b+15 = 0 // - 15
5*b = -15 // : 5
b = -15/5
b = -3
b = -3
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