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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m = 8/6 // - 8/6
5/m-(8/6) = 0
5/m-4/3 = 0
5*m^-1 = 4/3 // : 5
m^-1 = 4/15
-1 < 0
1/(m^1) = 4/15 // * m^1
1 = 4/15*m^1 // : 4/15
15/4 = m^1
m = 15/4
m = 15/4
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