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D( x )
20*m^-4*n^-4 = 0
20*m^-4*n^-4 = 0
20*m^-4*n^-4 = 0
20*m^-4*n^-4 = 0
x należy do R
x belongs to the empty set
(15*m^-6*n^8)/(20*m^-4*n^-4) = 0
x belongs to the empty set
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