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D( a )
(a^3)^8 = 0
(a^3)^8 = 0
(a^3)^8 = 0
1*a^24 = 0 // : 1
a^24 = 0
a = 0
a in (-oo:0) U (0:+oo)
((a^2)^7)/((a^3)^8) = 0
1*a^-10 = 0 // : 1
a^-10 = 0
a naleu017Cy do O
a belongs to the empty set
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