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(3*x)/5 = 2/7 // - 2/7
(3*x)/5-(2/7) = 0
(3*x)/5-2/7 = 0
3/5*x-2/7 = 0 // + 2/7
3/5*x = 2/7 // : 3/5
x = 2/7/3/5
x = 10/21
x = 10/21
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