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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 9/27 // - 9/27
11/x-(9/27) = 0
11/x-1/3 = 0
11*x^-1 = 1/3 // : 11
x^-1 = 1/33
-1 < 0
1/(x^1) = 1/33 // * x^1
1 = 1/33*x^1 // : 1/33
33 = x^1
x = 33
x = 33
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