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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
6.5/M = 8.2/41 // - 8.2/41
6.5/M-(8.2/41) = 0
6.5/M-0.2 = 0
6.5*M^-1 = 0.2 // : 6.5
M^-1 = 0.03076923
-1 < 0
1/(M^1) = 0.03076923 // * M^1
1 = 0.03076923*M^1 // : 0.03076923
32.50000081 = M^1
M = 32.50000081
M = 32.50000081
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