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(5*x)/7 = 20/14 // - 20/14
(5*x)/7-(20/14) = 0
(5*x)/7-10/7 = 0
5/7*x-10/7 = 0 // + 10/7
5/7*x = 10/7 // : 5/7
x = 10/7/5/7
x = 2
x = 2
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