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(5/7)*x+1/3 = 31/63 // - 31/63
(5/7)*x+1/3-(31/63) = 0
(5/7)*x+1/3-31/63 = 0
5/7*x-10/63 = 0 // + 10/63
5/7*x = 10/63 // : 5/7
x = 10/63/5/7
x = 2/9
x = 2/9
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