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X in (-oo:+oo)
(X^3-(12*X))/4 = 0
(X^3-12*X)/4 = 0
X^3-12*X = 0
X*(X^2-12) = 0
1*X^2 = 12 // : 1
X^2 = 12
X^2 = 12 // ^ 1/2
abs(X) = 2*3^(1/2)
X = 2*3^(1/2) or X = -(2*3^(1/2))
X*(X-2*3^(1/2))*(X+2*3^(1/2)) = 0
(X*(X-2*3^(1/2))*(X+2*3^(1/2)))/4 = 0
( X+2*3^(1/2) )
X+2*3^(1/2) = 0 // - 2*3^(1/2)
X = -(2*3^(1/2))
X = -2*3^(1/2)
( X-2*3^(1/2) )
X-2*3^(1/2) = 0 // + -2*3^(1/2)
X = -(-2*3^(1/2))
X = 2*3^(1/2)
( X )
X = 0
X in { -2*3^(1/2), 2*3^(1/2), 0 }
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