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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/8 = 10/m // - 10/m
3/8-(10/m) = 0
3/8-10*m^-1 = 0
-10*m^-1 = -3/8 // : -10
m^-1 = 3/80
-1 < 0
1/(m^1) = 3/80 // * m^1
1 = 3/80*m^1 // : 3/80
80/3 = m^1
m = 80/3
m = 80/3
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