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