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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/m = 3/14 // - 3/14
5/m-(3/14) = 0
5/m-3/14 = 0
5*m^-1 = 3/14 // : 5
m^-1 = 3/70
-1 < 0
1/(m^1) = 3/70 // * m^1
1 = 3/70*m^1 // : 3/70
70/3 = m^1
m = 70/3
m = 70/3
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