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D( m )
m^7 = 0
m^7 = 0
m^7 = 0
1*m^7 = 0 // : 1
m^7 = 0
m = 0
m in (-oo:0) U (0:+oo)
((((8*m^5)^1)/3)/(m^7))/6 = 0
(((8*m^5)/3)/(m^7))/6 = 0
4/9*m^-2 = 0 // : 4/9
m^-2 = 0
m należy do O
m belongs to the empty set
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