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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m-(2/m) = 6 // - 6
5/m-(2/m)-6 = 0
5/m-2*m^-1-6 = 0
3*m^-1 = 6 // : 3
m^-1 = 2
-1 < 0
1/(m^1) = 2 // * m^1
1 = 2*m^1 // : 2
1/2 = m^1
m = 1/2
m = 1/2
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