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(2/3)*x-(4/3) = 9 // - 9
(2/3)*x-(4/3)-9 = 0
(2/3)*x-4/3-9 = 0
2/3*x-31/3 = 0 // + 31/3
2/3*x = 31/3 // : 2/3
x = 31/3/2/3
x = 31/2
x = 31/2
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