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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
13/23 = 9/X // - 9/X
13/23-(9/X) = 0
13/23-9*X^-1 = 0
-9*X^-1 = -13/23 // : -9
X^-1 = 13/207
-1 < 0
1/(X^1) = 13/207 // * X^1
1 = 13/207*X^1 // : 13/207
207/13 = X^1
X = 207/13
X = 207/13
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