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D( x )
(r^-4)^4 = 0
(r^-4)^4 = 0
(r^-4)^4 = 0
r^-16 = 0
x należy do R
x belongs to the empty set
(R^5*(r^3)^2)/((r^-4)^4) = 0
x belongs to the empty set
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