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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
5/M = 10 // - 10
5/M-10 = 0
5*M^-1 = 10 // : 5
M^-1 = 2
-1 < 0
1/(M^1) = 2 // * M^1
1 = 2*M^1 // : 2
1/2 = M^1
M = 1/2
M = 1/2
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