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D( x )
x^4 = 0
y^6 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
y^6 = 0
y^6 = 0
y^6 = 0
x naleu017Cy do R
x belongs to the empty set
(((x^5)/(y^6))*y^4)/(x^4) = 0
x belongs to the empty set
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