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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/m-3 = 2/7 // - 2/7
4/m-(2/7)-3 = 0
4/m-2/7-3 = 0
4*m^-1 = 23/7 // : 4
m^-1 = 23/28
-1 < 0
1/(m^1) = 23/28 // * m^1
1 = 23/28*m^1 // : 23/28
28/23 = m^1
m = 28/23
m = 28/23
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