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x in (-oo:+oo)
(1/4)*x^2 = 64 // - 64
(1/4)*x^2-64 = 0
1/4*x^2 = 64 // : 1/4
x^2 = 256
x^2 = 256 // ^ 1/2
abs(x) = 16
x = 16 or x = -16
x in { 16, -16 }
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