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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/m = 12 // - 12
4/m-12 = 0
4*m^-1 = 12 // : 4
m^-1 = 3
-1 < 0
1/(m^1) = 3 // * m^1
1 = 3*m^1 // : 3
1/3 = m^1
m = 1/3
m = 1/3
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