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x in (-oo:+oo)
11/9 = x+5/9 // - x+5/9
11/9-x-(5/9) = 0
11/9-x-5/9 = 0
2/3-x = 0 // - 2/3
-x = -2/3 // * -1
x = 2/3
x = 2/3
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