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b in (-oo:+oo)
5*(3*b+9) = 105 // - 105
5*(3*b+9)-105 = 0
5*(3*b+9)-105 = 0
15*b-60 = 0
15*b-60 = 0
15*b-60 = 0 // + 60
15*b = 60 // : 15
b = 60/15
b = 4
b = 4
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