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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
11/X = 3.666 // - 3.666
11/X-3.666 = 0
11*X^-1 = 3.666 // : 11
X^-1 = 0.33327273
-1 < 0
1/(X^1) = 0.33327273 // * X^1
1 = 0.33327273*X^1 // : 0.33327273
3.00054553 = X^1
X = 3.00054553
X = 3.00054553
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