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D( x )
4*a^8*b^4 = 0
4*a^8*b^4 = 0
4*a^8*b^4 = 0
4*a^8*b^4 = 0
x należy do R
x belongs to the empty set
(2*a^-4*b^-3)/(4*a^8*b^4) = 0
x belongs to the empty set
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