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