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