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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(6/3)/2 = 12/m // - 12/m
(6/3)/2-(12/m) = 0
(6/3)/2-12*m^-1 = 0
-12*m^-1 = -1 // : -12
m^-1 = 1/12
-1 < 0
1/(m^1) = 1/12 // * m^1
1 = 1/12*m^1 // : 1/12
12 = m^1
m = 12
m = 12
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