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a in (-oo:+oo)
(3/5)*(a-6) = 15 // - 15
(3/5)*(a-6)-15 = 0
3/5*(a-6)-15 = 0
3/5*(a-6)-15 = 0
3/5*a-93/5 = 0
3/5*a-93/5 = 0
3/5*a-93/5 = 0 // + 93/5
3/5*a = 93/5 // : 3/5
a = 93/5/3/5
a = 31
a = 31
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