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D( x )
(((a^2)/3)*b^-1)/2 = 0
(((a^2)/3)*b^-1)/2 = 0
(((a^2)/3)*b^-1)/2 = 0
1/6*a^2*b^-1 = 0
x należy do R
x belongs to the empty set
((((a^2)/3)*b^-1)/2)^-6 = 0
x belongs to the empty set
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