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(3/7)*x+6/7 = 12/11 // - 12/11
(3/7)*x+6/7-(12/11) = 0
(3/7)*x+6/7-12/11 = 0
3/7*x-18/77 = 0 // + 18/77
3/7*x = 18/77 // : 3/7
x = 18/77/3/7
x = 6/11
x = 6/11
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