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b in (-oo:+oo)
5*(3*b+10) = 125 // - 125
5*(3*b+10)-125 = 0
5*(3*b+10)-125 = 0
15*b-75 = 0
15*b-75 = 0
15*b-75 = 0 // + 75
15*b = 75 // : 15
b = 75/15
b = 5
b = 5
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