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(2/3)*x-(4/9) = 55/18 // - 55/18
(2/3)*x-(4/9)-(55/18) = 0
(2/3)*x-4/9-55/18 = 0
2/3*x-7/2 = 0 // + 7/2
2/3*x = 7/2 // : 2/3
x = 7/2/2/3
x = 21/4
x = 21/4
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