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a in (-oo:+oo)
5*(3*a-8) = 35 // - 35
5*(3*a-8)-35 = 0
5*(3*a-8)-35 = 0
15*a-75 = 0
15*a-75 = 0
15*a-75 = 0 // + 75
15*a = 75 // : 15
a = 75/15
a = 5
a = 5
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