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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
0.05/m = 13.8 // - 13.8
0.05/m-13.8 = 0
0.05*m^-1 = 13.8 // : 0.05
m^-1 = 276
-1 < 0
1/(m^1) = 276 // * m^1
1 = 276*m^1 // : 276
1/276 = m^1
m = 1/276
m = 1/276
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