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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(m^-4*((m^7)/3))/3 = 0
1/9*m^3 = 0 // : 1/9
m^3 = 0
m = 0
m in { 0}
m belongs to the empty set
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