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(4*x)/5 = 8/9 // - 8/9
(4*x)/5-(8/9) = 0
(4*x)/5-8/9 = 0
4/5*x-8/9 = 0 // + 8/9
4/5*x = 8/9 // : 4/5
x = 8/9/4/5
x = 10/9
x = 10/9
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