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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(5/2)^2 = 124/X // - 124/X
(5/2)^2-(124/X) = 0
(5/2)^2-124*X^-1 = 0
-124*X^-1 = -25/4 // : -124
X^-1 = 25/496
-1 < 0
1/(X^1) = 25/496 // * X^1
1 = 25/496*X^1 // : 25/496
496/25 = X^1
X = 496/25
X = 496/25
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