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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6-(n/n) > 11 // - 11
6-(n/n)-11 > 0
6-11-1 > 0
-6 > 0
n belongs to the empty set
n belongs to the empty set
0
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