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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a^-2*((3*a^-1)/9) = 0
1/3*a^-3 = 0 // : 1/3
a^-3 = 0
a naleu017Cy do O
a belongs to the empty set
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