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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
8/X = 300/650 // - 300/650
8/X-(300/650) = 0
8/X-6/13 = 0
8*X^-1 = 6/13 // : 8
X^-1 = 3/52
-1 < 0
1/(X^1) = 3/52 // * X^1
1 = 3/52*X^1 // : 3/52
52/3 = X^1
X = 52/3
X = 52/3
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