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(7/9)*x-(5/6) = 2/3 // - 2/3
(7/9)*x-(5/6)-(2/3) = 0
(7/9)*x-5/6-2/3 = 0
7/9*x-3/2 = 0 // + 3/2
7/9*x = 3/2 // : 7/9
x = 3/2/7/9
x = 27/14
x = 27/14
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