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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-16/3 = 80/m // - 80/m
-(80/m)-16/3 = 0
-80*m^-1-16/3 = 0
-80*m^-1 = 16/3 // : -80
m^-1 = -1/15
-1 < 0
1/(m^1) = -1/15 // * m^1
1 = -1/15*m^1 // : -1/15
-15 = m^1
m = -15
m = -15
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