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D( x )
n^3 = 0
(3*m^2*n^-1)/(n^3) = 0
n^3 = 0
n^3 = 0
n^3 = 0
x naleu017Cy do R
(3*m^2*n^-1)/(n^3) = 0
(3*m^2*n^-1)/(n^3) = 0
3*m^2*n^-4 = 0
x naleu017Cy do R
x belongs to the empty set
((3*m^2*n^-1)/(n^3))^-3 = 0
x belongs to the empty set
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