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16^4-(((8^2)/4)*x^2)-12^3 = 0
-16*x^2 = -63808 // : -16
x^2 = 3988
x^2 = 3988 // ^ 1/2
abs(x) = 2*997^(1/2)
x = 2*997^(1/2) or x = -(2*997^(1/2))
x in { 2*997^(1/2), -(2*997^(1/2)) }
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