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