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X in (-oo:+oo)
X^2-5^(1/2)-3 = 0
1*X^2 = 5^(1/2)+3 // : 1
X^2 = 5^(1/2)+3
X^2 = 5^(1/2)+3 // ^ 1/2
abs(X) = (5^(1/2)+3)^(1/2)
X = (5^(1/2)+3)^(1/2) or X = -(5^(1/2)+3)^(1/2)
X in { (5^(1/2)+3)^(1/2), -(5^(1/2)+3)^(1/2) }
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