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D( M )
M = 0
M = 0
M = 0
M in (-oo:0) U (0:+oo)
(4*M)/M-8/M-2-2 = 0
-8*M^-1 = 0 // : -8
M^-1 = 0
M naleu017Cy do O
M belongs to the empty set
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