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D( x )
z^-9 = 0
x = 0
z^-9 = 0
z^-9 = 0
z^-9 = 0
x należy do R
x = 0
x = 0
x belongs to the empty set
(x^-6*y^-3)/(z^-9) = 0
x belongs to the empty set
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