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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a/a-3 = 4/3 // - 4/3
a/a-(4/3)-3 = 0
a/a-4/3-3 = 0
-10/3 = 0
a belongs to the empty set
a belongs to the empty set
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