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x in (-oo:+oo)
(x^2)/8 = 32 // - 32
(x^2)/8-32 = 0
1/8*x^2 = 32 // : 1/8
x^2 = 256
x^2 = 256 // ^ 1/2
abs(x) = 16
x = 16 or x = -16
x in { 16, -16 }
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