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(5*a)/9-(a/5) = 16/3 // - 16/3
(5*a)/9-(a/5)-(16/3) = 0
(5*a)/9-(a/5)-16/3 = 0
16/45*a-16/3 = 0 // + 16/3
16/45*a = 16/3 // : 16/45
a = 16/3/16/45
a = 15
a = 15
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