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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/9 = 33/x // - 33/x
11/9-(33/x) = 0
11/9-33*x^-1 = 0
-33*x^-1 = -11/9 // : -33
x^-1 = 1/27
-1 < 0
1/(x^1) = 1/27 // * x^1
1 = 1/27*x^1 // : 1/27
27 = x^1
x = 27
x = 27
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