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D( x )
10*a^3*b^2 = 0
10*a^3*b^2 = 0
10*a^3*b^2 = 0
10*a^3*b^2 = 0
x należy do R
x belongs to the empty set
((2*a^-2*b^4)^3*b)/(10*a^3*b^2) = 0
x belongs to the empty set
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