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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
7/M = 0.6/3 // - 0.6/3
7/M-(0.6/3) = 0
7/M-0.2 = 0
7*M^-1 = 0.2 // : 7
M^-1 = 0.02857143
-1 < 0
1/(M^1) = 0.02857143 // * M^1
1 = 0.02857143*M^1 // : 0.02857143
34.99999825 = M^1
M = 34.99999825
M = 34.99999825
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