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(3/5)*x+4/5 = 12 // - 12
(3/5)*x+4/5-12 = 0
3/5*x-56/5 = 0 // + 56/5
3/5*x = 56/5 // : 3/5
x = 56/5/3/5
x = 56/3
x = 56/3
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