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D( x )
-2*u^5*z^4 = 0
-2*u^5*z^4 = 0
-2*u^5*z^4 = 0
-2*u^5*z^4 = 0
x naleu017Cy do R
x belongs to the empty set
(5*u^7*z^6-6*u^4*z^6)/(-2*u^5*z^4) = 0
x belongs to the empty set
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