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x in (-oo:+oo)
(1/2)*x^2 = 32 // - 32
(1/2)*x^2-32 = 0
1/2*x^2 = 32 // : 1/2
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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