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(6*x)/7 = 25/21 // - 25/21
(6*x)/7-(25/21) = 0
(6*x)/7-25/21 = 0
6/7*x-25/21 = 0 // + 25/21
6/7*x = 25/21 // : 6/7
x = 25/21/6/7
x = 25/18
x = 25/18
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