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D( x )
6*a^4*y*y = 0
6*a^4*y*y = 0
6*a^4*y*y = 0
6*a^4*y^2 = 0
x należy do R
x belongs to the empty set
(4*5*a^3*y^4)/(6*a^4*y*y) = 0
x belongs to the empty set
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