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D( X )
X^2 = 0
X^2 = 0
X^2 = 0
1*X^2 = 0 // : 1
X^2 = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^(9/7))/(X^2) = 0
1*X^(-5/7) = 0 // : 1
X^(-5/7) = 0
X należy do O
X belongs to the empty set
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