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x in (-oo:+oo)
4/9-x = 2/3 // - 2/3
4/9-x-(2/3) = 0
4/9-x-2/3 = 0
-x-2/9 = 0 // + 2/9
-x = 2/9 // * -1
x = -2/9
x = -2/9
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