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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m-2 = 9/11 // - 9/11
5/m-(9/11)-2 = 0
5/m-9/11-2 = 0
5*m^-1 = 31/11 // : 5
m^-1 = 31/55
-1 < 0
1/(m^1) = 31/55 // * m^1
1 = 31/55*m^1 // : 31/55
55/31 = m^1
m = 55/31
m = 55/31
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