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X^3-x^2-(64/16) = 0
X^3-x^2-4 = 0
-1*x^2 = -(X^3-4) // : -1
x^2 = X^3-4
x^2 = X^3-4 // ^ 1/2
abs(x) = (X^3-4)^(1/2)
x = (X^3-4)^(1/2) or x = -(X^3-4)^(1/2)
x in { (X^3-4)^(1/2), -(X^3-4)^(1/2) }
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