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D( a )
a^6 = 0
a^6 = 0
a^6 = 0
1*a^6 = 0 // : 1
a^6 = 0
a = 0
a in (-oo:0) U (0:+oo)
(a^8)/(a^6) = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in { 0}
a belongs to the empty set
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