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D( X )
X^13 = 0
X^13 = 0
X^13 = 0
1*X^13 = 0 // : 1
X^13 = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^17)/(X^13) = 0
1*X^4 = 0 // : 1
X^4 = 0
X = 0
X in { 0}
X belongs to the empty set
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