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(2/5)*x = 4/9 // - 4/9
(2/5)*x-(4/9) = 0
(2/5)*x-4/9 = 0
2/5*x-4/9 = 0 // + 4/9
2/5*x = 4/9 // : 2/5
x = 4/9/2/5
x = 10/9
x = 10/9
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