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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4 = 3/m-1 // - 3/m-1
1-(3/m)+4 = 0
1-3*m^-1+4 = 0
-3*m^-1 = -5 // : -3
m^-1 = 5/3
-1 < 0
1/(m^1) = 5/3 // * m^1
1 = 5/3*m^1 // : 5/3
3/5 = m^1
m = 3/5
m = 3/5
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