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(3/5)*x-(8/15) = 5 // - 5
(3/5)*x-(8/15)-5 = 0
(3/5)*x-8/15-5 = 0
3/5*x-83/15 = 0 // + 83/15
3/5*x = 83/15 // : 3/5
x = 83/15/3/5
x = 83/9
x = 83/9
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