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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
25/100 = 8/M // - 8/M
25/100-(8/M) = 0
25/100-8*M^-1 = 0
-8*M^-1 = -1/4 // : -8
M^-1 = 1/32
-1 < 0
1/(M^1) = 1/32 // * M^1
1 = 1/32*M^1 // : 1/32
32 = M^1
M = 32
M = 32
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