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(2*x)/7 = 9/5 // - 9/5
(2*x)/7-(9/5) = 0
(2*x)/7-9/5 = 0
2/7*x-9/5 = 0 // + 9/5
2/7*x = 9/5 // : 2/7
x = 9/5/2/7
x = 63/10
x = 63/10
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