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(3*x)/7 = 3/5 // - 3/5
(3*x)/7-(3/5) = 0
(3*x)/7-3/5 = 0
3/7*x-3/5 = 0 // + 3/5
3/7*x = 3/5 // : 3/7
x = 3/5/3/7
x = 7/5
x = 7/5
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