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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
20/6 = 40/m // - 40/m
20/6-(40/m) = 0
20/6-40*m^-1 = 0
-40*m^-1 = -10/3 // : -40
m^-1 = 1/12
-1 < 0
1/(m^1) = 1/12 // * m^1
1 = 1/12*m^1 // : 1/12
12 = m^1
m = 12
m = 12
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