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D( x )
m^-1*n^7 = 0
m^-1*n^7 = 0
m^-1*n^7 = 0
m^-1*n^7 = 0
x należy do R
x belongs to the empty set
(((m^2)/5)*n^3)/(m^-1*n^7) = 0
x belongs to the empty set
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