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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
16/3 = 12/X // - 12/X
16/3-(12/X) = 0
16/3-12*X^-1 = 0
-12*X^-1 = -16/3 // : -12
X^-1 = 4/9
-1 < 0
1/(X^1) = 4/9 // * X^1
1 = 4/9*X^1 // : 4/9
9/4 = X^1
X = 9/4
X = 9/4
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