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D( x )
2*v^6*y^4 = 0
2*v^6*y^4 = 0
2*v^6*y^4 = 0
2*v^6*y^4 = 0
x naleu017Cy do R
x belongs to the empty set
(6*w^2*y^2+8*y^4)/(2*v^6*y^4) = 0
x belongs to the empty set
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