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