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D( X )
X^6 = 0
(X^8)/(X^6) = 0
X^6 = 0
X^6 = 0
1*X^6 = 0 // : 1
X^6 = 0
X = 0
(X^8)/(X^6) = 0
(X^8)/(X^6) = 0
1*X^2 = 0 // : 1
X^2 = 0
X = 0
X in (-oo:0) U (0:+oo)
((X^8)/(X^6))^-4 = 0
1*X^-8 = 0 // : 1
X^-8 = 0
X należy do O
X belongs to the empty set
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