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D( x )
(2*m^-2*n)^3 = 0
(2*m^-2*n)^3 = 0
(2*m^-2*n)^3 = 0
8*m^-6*n^3 = 0
x należy do R
x belongs to the empty set
((3*m^-1*n^2)^4)/((2*m^-2*n)^3) = 0
x belongs to the empty set
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