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D( x )
m^-7 = 0
m^6*n = 0
m^-7 = 0
m^-7 = 0
m^-7 = 0
x należy do R
m^6*n = 0
m^6*n = 0
m^6*n = 0
x należy do R
x belongs to the empty set
(((m^6*n)^-4)/(m^-7))*n^4 = 0
x belongs to the empty set
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