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(2*x)/7 = 5/28 // - 5/28
(2*x)/7-(5/28) = 0
(2*x)/7-5/28 = 0
2/7*x-5/28 = 0 // + 5/28
2/7*x = 5/28 // : 2/7
x = 5/28/2/7
x = 5/8
x = 5/8
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