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(3*x)/7 = 6/7 // - 6/7
(3*x)/7-(6/7) = 0
(3*x)/7-6/7 = 0
3/7*x-6/7 = 0 // + 6/7
3/7*x = 6/7 // : 3/7
x = 6/7/3/7
x = 2
x = 2
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