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(3/5)*x = 4/5+12/5 // - 4/5+12/5
(3/5)*x-(4/5)-(12/5) = 0
(3/5)*x-4/5-12/5 = 0
3/5*x-16/5 = 0 // + 16/5
3/5*x = 16/5 // : 3/5
x = 16/5/3/5
x = 16/3
x = 16/3
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