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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
6/m = 30/40 // - 30/40
6/m-(30/40) = 0
6/m-3/4 = 0
6*m^-1 = 3/4 // : 6
m^-1 = 1/8
-1 < 0
1/(m^1) = 1/8 // * m^1
1 = 1/8*m^1 // : 1/8
8 = m^1
m = 8
m = 8
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