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