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D( x )
X^(5/4)*z^(1/4) = 0
X^(5/4)*z^(1/4) = 0
X^(5/4)*z^(1/4) = 0
X^(5/4)*z^(1/4) = 0
x należy do R
x belongs to the empty set
(X^(5/4)*z^(1/4))^-2 = 0
x belongs to the empty set
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