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(4/3)*x = 8/9 // - 8/9
(4/3)*x-(8/9) = 0
(4/3)*x-8/9 = 0
4/3*x-8/9 = 0 // + 8/9
4/3*x = 8/9 // : 4/3
x = 8/9/4/3
x = 2/3
x = 2/3
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