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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 11/9 // - 11/9
3/x-(11/9) = 0
3/x-11/9 = 0
3*x^-1 = 11/9 // : 3
x^-1 = 11/27
-1 < 0
1/(x^1) = 11/27 // * x^1
1 = 11/27*x^1 // : 11/27
27/11 = x^1
x = 27/11
x = 27/11
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