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a in (-oo:+oo)
(3/5)*(a-8) = 9 // - 9
(3/5)*(a-8)-9 = 0
3/5*(a-8)-9 = 0
3/5*(a-8)-9 = 0
3/5*a-69/5 = 0
3/5*a-69/5 = 0
3/5*a-69/5 = 0 // + 69/5
3/5*a = 69/5 // : 3/5
a = 69/5/3/5
a = 23
a = 23
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