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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/m = 10/25 // - 10/25
2/m-(10/25) = 0
2/m-2/5 = 0
2*m^-1 = 2/5 // : 2
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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