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x in (-oo:+oo)
(X^2)/6-(x/3) = 1 // - 1
(X^2)/6-(x/3)-1 = 0
1/6*X^2-1/3*x-1 = 0 // - 1/6*X^2-1
-1/3*x = -(1/6*X^2-1) // : -1/3
x = (-(1/6*X^2-1))/(-1/3)
x = -3*(1-(1/6*X^2))
x = -3*(1-(1/6*X^2))
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