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(10*x)/49 = 5/7 // - 5/7
(10*x)/49-(5/7) = 0
(10*x)/49-5/7 = 0
10/49*x-5/7 = 0 // + 5/7
10/49*x = 5/7 // : 10/49
x = 5/7/10/49
x = 7/2
x = 7/2
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