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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/66 = 4000/m // - 4000/m
5/66-(4000/m) = 0
5/66-4000*m^-1 = 0
-4000*m^-1 = -5/66 // : -4000
m^-1 = 1/52800
-1 < 0
1/(m^1) = 1/52800 // * m^1
1 = 1/52800*m^1 // : 1/52800
52800 = m^1
m = 52800
m = 52800
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