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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3.6/m = 1.2 // - 1.2
3.6/m-1.2 = 0
3.6*m^-1 = 1.2 // : 3.6
m^-1 = 0.33333333
-1 < 0
1/(m^1) = 0.33333333 // * m^1
1 = 0.33333333*m^1 // : 0.33333333
3.00000003 = m^1
m = 3.00000003
m = 3.00000003
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