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a in (-oo:+oo)
(1/2)*a^2-8 = 0
1/2*a^2 = 8 // : 1/2
a^2 = 16
a^2 = 16 // ^ 1/2
abs(a) = 4
a = 4 or a = -4
a in { 4, -4 }
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