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D( x )
y^-4*z^(1/4) < 0
y^-4*z^(1/4) < 0
y^-4*z^(1/4) < 0
y^-4*z^(1/4) < 0
x należy do R
x belongs to the empty set
(y^-4*z^(1/4))^(3/4) = 0
x belongs to the empty set
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