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x in (-oo:+oo)
1/9 = x+2/3 // - x+2/3
1/9-x-(2/3) = 0
1/9-x-2/3 = 0
-x-5/9 = 0 // + 5/9
-x = 5/9 // * -1
x = -5/9
x = -5/9
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