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D( x )
(-4*p^2*q^20)^3 = 0
(-4*p^2*q^20)^3 = 0
(-4*p^2*q^20)^3 = 0
-64*p^6*q^60 = 0
x należy do R
x belongs to the empty set
((-2*p^6*q^9)^5)/((-4*p^2*q^20)^3) = 0
x belongs to the empty set
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