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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
7/M = 3/5 // - 3/5
7/M-(3/5) = 0
7/M-3/5 = 0
7*M^-1 = 3/5 // : 7
M^-1 = 3/35
-1 < 0
1/(M^1) = 3/35 // * M^1
1 = 3/35*M^1 // : 3/35
35/3 = M^1
M = 35/3
M = 35/3
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