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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
11/20 = 5/X // - 5/X
11/20-(5/X) = 0
11/20-5*X^-1 = 0
-5*X^-1 = -11/20 // : -5
X^-1 = 11/100
-1 < 0
1/(X^1) = 11/100 // * X^1
1 = 11/100*X^1 // : 11/100
100/11 = X^1
X = 100/11
X = 100/11
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