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D( x )
-3*u^4*z^2 = 0
-3*u^4*z^2 = 0
-3*u^4*z^2 = 0
-3*u^4*z^2 = 0
x należy do R
x belongs to the empty set
(9*u^5*z^7-(26*u^5*z))/(-3*u^4*z^2) = 0
x belongs to the empty set
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