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(5/7)*x+2/3 = 29/21 // - 29/21
(5/7)*x+2/3-(29/21) = 0
(5/7)*x+2/3-29/21 = 0
5/7*x-5/7 = 0 // + 5/7
5/7*x = 5/7 // : 5/7
x = 5/7/5/7
x = 1
x = 1
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