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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
7/3 = (342^2)/X // - (342^2)/X
7/3-((342^2)/X) = 0
-116964*X^-1 = -7/3 // : -116964
X^-1 = 7/350892
-1 < 0
1/(X^1) = 7/350892 // * X^1
1 = 7/350892*X^1 // : 7/350892
350892/7 = X^1
X = 350892/7
X = 350892/7
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