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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
27/m = 10/3 // - 10/3
27/m-(10/3) = 0
27/m-10/3 = 0
27*m^-1 = 10/3 // : 27
m^-1 = 10/81
-1 < 0
1/(m^1) = 10/81 // * m^1
1 = 10/81*m^1 // : 10/81
81/10 = m^1
m = 81/10
m = 81/10
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