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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
11/X = 17/5 // - 17/5
11/X-(17/5) = 0
11/X-17/5 = 0
11*X^-1 = 17/5 // : 11
X^-1 = 17/55
-1 < 0
1/(X^1) = 17/55 // * X^1
1 = 17/55*X^1 // : 17/55
55/17 = X^1
X = 55/17
X = 55/17
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