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b in (-oo:+oo)
5*(3*b-10) = 130 // - 130
5*(3*b-10)-130 = 0
5*(3*b-10)-130 = 0
15*b-180 = 0
15*b-180 = 0
15*b-180 = 0 // + 180
15*b = 180 // : 15
b = 180/15
b = 12
b = 12
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