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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 2/9 // - 2/9
3/x-(2/9) = 0
3/x-2/9 = 0
3*x^-1 = 2/9 // : 3
x^-1 = 2/27
-1 < 0
1/(x^1) = 2/27 // * x^1
1 = 2/27*x^1 // : 2/27
27/2 = x^1
x = 27/2
x = 27/2
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