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D( x )
m^-19 = 0
m^8*n = 0
m^-19 = 0
m^-19 = 0
m^-19 = 0
x należy do R
m^8*n = 0
m^8*n = 0
m^8*n = 0
x należy do R
x belongs to the empty set
(((m^8*n)^-7)/(m^-19))*n^7 = 0
x belongs to the empty set
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