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a in (-oo:+oo)
(4*a)/3+a/15 = 12 // - 12
(4*a)/3+a/15-12 = 0
7/5*a-12 = 0 // + 12
7/5*a = 12 // : 7/5
a = 12/7/5
a = 60/7
a = 60/7
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