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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
64/m = 24/9 // - 24/9
64/m-(24/9) = 0
64/m-8/3 = 0
64*m^-1 = 8/3 // : 64
m^-1 = 1/24
-1 < 0
1/(m^1) = 1/24 // * m^1
1 = 1/24*m^1 // : 1/24
24 = m^1
m = 24
m = 24
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