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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/m = 10/3 // - 10/3
2/m-(10/3) = 0
2/m-10/3 = 0
2*m^-1 = 10/3 // : 2
m^-1 = 5/3
-1 < 0
1/(m^1) = 5/3 // * m^1
1 = 5/3*m^1 // : 5/3
3/5 = m^1
m = 3/5
m = 3/5
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