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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4-(m/m) >= 5 // - 5
4-(m/m)-5 >= 0
4-5-1 >= 0
-2 >= 0
m belongs to the empty set
m belongs to the empty set
0
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