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(6/7)*x-3 = 13/7 // - 13/7
(6/7)*x-(13/7)-3 = 0
(6/7)*x-13/7-3 = 0
6/7*x-34/7 = 0 // + 34/7
6/7*x = 34/7 // : 6/7
x = 34/7/6/7
x = 17/3
x = 17/3
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