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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m+6/m-2 = 0
1*m^1+6*m^-1-2*m^0 = 0
(1*m^2-2*m^1+6*m^0)/(m^1) = 0 // * m^2
m^1*(1*m^2-2*m^1+6*m^0) = 0
m^1
m^2-2*m+6 = 0
m^2-2*m+6 = 0
DELTA = (-2)^2-(1*4*6)
DELTA = -20
DELTA < 0
m in { }
m belongs to the empty set
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