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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 10/11 // - 10/11
3/x-(10/11) = 0
3/x-10/11 = 0
3*x^-1 = 10/11 // : 3
x^-1 = 10/33
-1 < 0
1/(x^1) = 10/33 // * x^1
1 = 10/33*x^1 // : 10/33
33/10 = x^1
x = 33/10
x = 33/10
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