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b in (-oo:+oo)
3*(5*b+6) = 93 // - 93
3*(5*b+6)-93 = 0
3*(5*b+6)-93 = 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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