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D( x )
x^6*y^2 = 0
X^9*y^6 = 0
(x^6*y^2)^-1 = 0
x^6*y^2 = 0
x^6*y^2 = 0
x^6*y^2 = 0 // : y^2
x^6 = 0
x = 0
X^9*y^6 = 0
X^9*y^6 = 0
X^9*y^6 = 0
x należy do R
(x^6*y^2)^-1 = 0
(x^6*y^2)^-1 = 0
x^-6*y^-2 = 0 // : y^-2
x^-6 = 0
x należy do O
x belongs to the empty set
((((X^9*y^6)^-1)/3)/((x^6*y^2)^-1))/2 = 0
x belongs to the empty set
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