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