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D( m )
-m = 0
-m = 0
m = 0
m in (-oo:0) U (0:+oo)
m-((2/(-m))/3) = m+1/2 // - m+1/2
m-m-((2/(-m))/3)-(1/2) = 0
m-m+(2/3)*m^-1-1/2 = 0
2/3*m^-1 = 1/2 // : 2/3
m^-1 = 3/4
-1 < 0
1/(m^1) = 3/4 // * m^1
1 = 3/4*m^1 // : 3/4
4/3 = m^1
m = 4/3
m = 4/3
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