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a in (-oo:+oo)
(3/5)*(10*a-5) = 15 // - 15
(3/5)*(10*a-5)-15 = 0
3/5*(10*a-5)-15 = 0
3/5*(10*a-5)-15 = 0
6*a-18 = 0
6*a-18 = 0
6*a-18 = 0 // + 18
6*a = 18 // : 6
a = 18/6
a = 3
a = 3
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