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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
12/m = 16 // - 16
12/m-16 = 0
12*m^-1 = 16 // : 12
m^-1 = 4/3
-1 < 0
1/(m^1) = 4/3 // * m^1
1 = 4/3*m^1 // : 4/3
3/4 = m^1
m = 3/4
m = 3/4
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