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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/8 = 30/m // - 30/m
3/8-(30/m) = 0
3/8-30*m^-1 = 0
-30*m^-1 = -3/8 // : -30
m^-1 = 1/80
-1 < 0
1/(m^1) = 1/80 // * m^1
1 = 1/80*m^1 // : 1/80
80 = m^1
m = 80
m = 80
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