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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 10/8 // - 10/8
3/m-(10/8) = 0
3/m-5/4 = 0
3*m^-1 = 5/4 // : 3
m^-1 = 5/12
-1 < 0
1/(m^1) = 5/12 // * m^1
1 = 5/12*m^1 // : 5/12
12/5 = m^1
m = 12/5
m = 12/5
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