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D( x )
3*m^-4*n^3 = 0
3*m^-4*n^3 = 0
3*m^-4*n^3 = 0
3*m^-4*n^3 = 0
x należy do R
x belongs to the empty set
(-12*m^-8*n^5)/(3*m^-4*n^3) = 0
x belongs to the empty set
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