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D( x )
-3*u^3*y^5 = 0
-3*u^3*y^5 = 0
-3*u^3*y^5 = 0
-3*u^3*y^5 = 0
x naleu017Cy do R
x belongs to the empty set
(19*u^7*y^2-21*u^7*y^7)/(-3*u^3*y^5) = 0
x belongs to the empty set
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