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D( m )
3*m = 0
m = 0
3*m = 0
3*m = 0
3*m = 0 // : 3
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(((3*m)^-4)/2)*m^-4 = 0
1/162*m^-8 = 0 // : 1/162
m^-8 = 0
m należy do O
m belongs to the empty set
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