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(3/7)*x+4/7 = 65/77 // - 65/77
(3/7)*x+4/7-(65/77) = 0
(3/7)*x+4/7-65/77 = 0
3/7*x-3/11 = 0 // + 3/11
3/7*x = 3/11 // : 3/7
x = 3/11/3/7
x = 7/11
x = 7/11
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