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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m-(m/5)+25/m = 0
4/5*m^1+25*m^-1 = 0
(4/5*m^2+25*m^0)/(m^1) = 0 // * m^2
m^1*(4/5*m^2+25*m^0) = 0
m^1
(4/5)*m^2+25 = 0
(4/5)*m^2+25 = 0
DELTA = 0^2-(4*25*(4/5))
DELTA = -80
DELTA < 0
m in { }
m belongs to the empty set
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