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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
13/X = 10/9 // - 10/9
13/X-(10/9) = 0
13/X-10/9 = 0
13*X^-1 = 10/9 // : 13
X^-1 = 10/117
-1 < 0
1/(X^1) = 10/117 // * X^1
1 = 10/117*X^1 // : 10/117
117/10 = X^1
X = 117/10
X = 117/10
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