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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
16/10 = 26/X // - 26/X
16/10-(26/X) = 0
16/10-26*X^-1 = 0
-26*X^-1 = -8/5 // : -26
X^-1 = 4/65
-1 < 0
1/(X^1) = 4/65 // * X^1
1 = 4/65*X^1 // : 4/65
65/4 = X^1
X = 65/4
X = 65/4
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