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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2/X-1 = 11 // - 11
2/X-11-1 = 0
2*X^-1 = 12 // : 2
X^-1 = 6
-1 < 0
1/(X^1) = 6 // * X^1
1 = 6*X^1 // : 6
1/6 = X^1
X = 1/6
X = 1/6
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