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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
8/9 = 65/X // - 65/X
8/9-(65/X) = 0
8/9-65*X^-1 = 0
-65*X^-1 = -8/9 // : -65
X^-1 = 8/585
-1 < 0
1/(X^1) = 8/585 // * X^1
1 = 8/585*X^1 // : 8/585
585/8 = X^1
X = 585/8
X = 585/8
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