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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m = 11/3 // - 11/3
9/m-(11/3) = 0
9/m-11/3 = 0
9*m^-1 = 11/3 // : 9
m^-1 = 11/27
-1 < 0
1/(m^1) = 11/27 // * m^1
1 = 11/27*m^1 // : 11/27
27/11 = m^1
m = 27/11
m = 27/11
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