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