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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 39/65 // - 39/65
3/m-(39/65) = 0
3/m-3/5 = 0
3*m^-1 = 3/5 // : 3
m^-1 = 1/5
-1 < 0
1/(m^1) = 1/5 // * m^1
1 = 1/5*m^1 // : 1/5
5 = m^1
m = 5
m = 5
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