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