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(2/3)*x+5/9 = 13/18 // - 13/18
(2/3)*x+5/9-(13/18) = 0
(2/3)*x+5/9-13/18 = 0
2/3*x-1/6 = 0 // + 1/6
2/3*x = 1/6 // : 2/3
x = 1/6/2/3
x = 1/4
x = 1/4
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