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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
8/m = 2/4 // - 2/4
8/m-(2/4) = 0
8/m-1/2 = 0
8*m^-1 = 1/2 // : 8
m^-1 = 1/16
-1 < 0
1/(m^1) = 1/16 // * m^1
1 = 1/16*m^1 // : 1/16
16 = m^1
m = 16
m = 16
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