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D( x )
-4*v^5*z^2 = 0
-4*v^5*z^2 = 0
-4*v^5*z^2 = 0
-4*v^5*z^2 = 0
x należy do R
x belongs to the empty set
(35*v^4*z^5-(25*v^6*z^5))/(-4*v^5*z^2) = 0
x belongs to the empty set
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