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D( a )
a+2 = 0
a+2 = 0
a+2 = 0
a+2 = 0 // - 2
a = -2
a in (-oo:-2) U (-2:+oo)
(a^3+8)/(a+2) = 0
1*a^3 = -8 // : 1
a^3 = -8
a^3 = -8 // ^ 1/3
a = -2
a in { -2}
a belongs to the empty set
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