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