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5/9 = 3*x+2/12 // - 3*x+2/12
5/9-(3*x)-(2/12) = 0
5/9-3*x-1/6 = 0
7/18-3*x = 0 // - 7/18
-3*x = -7/18 // : -3
x = -7/18/(-3)
x = 7/54
x = 7/54
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