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(2*x)/7 = 4/9 // - 4/9
(2*x)/7-(4/9) = 0
(2*x)/7-4/9 = 0
2/7*x-4/9 = 0 // + 4/9
2/7*x = 4/9 // : 2/7
x = 4/9/2/7
x = 14/9
x = 14/9
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