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D( x )
y^6 = 0
y^2 = 0
((-x)^3)/(y^6) = 0
y^6 = 0
y^6 = 0
y^6 = 0
x należy do R
y^2 = 0
y^2 = 0
y^2 = 0
x należy do R
((-x)^3)/(y^6) = 0
((-x)^3)/(y^6) = 0
x^3*(-y^-6) = 0 // : -y^-6
x^3 = 0
x = 0
x belongs to the empty set
((x^20)/(y^2))/(((-x)^3)/(y^6)) = 0
x belongs to the empty set
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