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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 5/12 // - 5/12
3/m-(5/12) = 0
3/m-5/12 = 0
3*m^-1 = 5/12 // : 3
m^-1 = 5/36
-1 < 0
1/(m^1) = 5/36 // * m^1
1 = 5/36*m^1 // : 5/36
36/5 = m^1
m = 36/5
m = 36/5
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