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(5/7)*x-(8/9) = -526/693 // + -526/693
(5/7)*x-(8/9)-(-526/693) = 0
(5/7)*x-8/9+526/693 = 0
5/7*x-10/77 = 0 // + 10/77
5/7*x = 10/77 // : 5/7
x = 10/77/5/7
x = 2/11
x = 2/11
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