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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/m = 16/5 // - 16/5
4/m-(16/5) = 0
4/m-16/5 = 0
4*m^-1 = 16/5 // : 4
m^-1 = 4/5
-1 < 0
1/(m^1) = 4/5 // * m^1
1 = 4/5*m^1 // : 4/5
5/4 = m^1
m = 5/4
m = 5/4
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