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(2/7)*x+8/9 = 272/63 // - 272/63
(2/7)*x+8/9-(272/63) = 0
(2/7)*x+8/9-272/63 = 0
2/7*x-24/7 = 0 // + 24/7
2/7*x = 24/7 // : 2/7
x = 24/7/2/7
x = 12
x = 12
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