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D( m )
m = 0
m^2 = 0
m = 0
m = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
(6*m)/(m^2)-(3/m)-4+2 = 0
(6*m)/(m^2)-3*m^-1-4+2 = 0
3*m^-1 = 2 // : 3
m^-1 = 2/3
-1 < 0
1/(m^1) = 2/3 // * m^1
1 = 2/3*m^1 // : 2/3
3/2 = m^1
m = 3/2
m = 3/2
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