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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3.9 = 34.2/m // - 34.2/m
3.9-(34.2/m) = 0
3.9-34.2*m^-1 = 0
-34.2*m^-1 = -3.9 // : -34.2
m^-1 = 0.11403509
-1 < 0
1/(m^1) = 0.11403509 // * m^1
1 = 0.11403509*m^1 // : 0.11403509
8.76923059 = m^1
m = 8.76923059
m = 8.76923059
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