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(2/3)*x = 7/9 // - 7/9
(2/3)*x-(7/9) = 0
(2/3)*x-7/9 = 0
2/3*x-7/9 = 0 // + 7/9
2/3*x = 7/9 // : 2/3
x = 7/9/2/3
x = 7/6
x = 7/6
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