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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1000/X = 11 // - 11
1000/X-11 = 0
1000*X^-1 = 11 // : 1000
X^-1 = 11/1000
-1 < 0
1/(X^1) = 11/1000 // * X^1
1 = 11/1000*X^1 // : 11/1000
1000/11 = X^1
X = 1000/11
X = 1000/11
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