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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/m = 8/11 // - 8/11
4/m-(8/11) = 0
4/m-8/11 = 0
4*m^-1 = 8/11 // : 4
m^-1 = 2/11
-1 < 0
1/(m^1) = 2/11 // * m^1
1 = 2/11*m^1 // : 2/11
11/2 = m^1
m = 11/2
m = 11/2
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