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D( x )
m^-2 = 0
((25*m^3*n^3)/(m^-2))*n^6 = 0
m^-2 = 0
m^-2 = 0
m^-2 = 0
x należy do R
((25*m^3*n^3)/(m^-2))*n^6 = 0
((25*m^3*n^3)/(m^-2))*n^6 = 0
25*m^5*n^9 = 0
x należy do R
x belongs to the empty set
(((25*m^3*n^3)/(m^-2))*n^6)^-2 = 0
x belongs to the empty set
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