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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
8/9 = 40/m // - 40/m
8/9-(40/m) = 0
8/9-40*m^-1 = 0
-40*m^-1 = -8/9 // : -40
m^-1 = 1/45
-1 < 0
1/(m^1) = 1/45 // * m^1
1 = 1/45*m^1 // : 1/45
45 = m^1
m = 45
m = 45
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