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x in (-oo:+oo)
(X^2)/12-(x/3) = o // - o
(X^2)/12-o-(x/3) = 0
1/12*X^2-o-1/3*x = 0 // - 1/12*X^2-o
-1/3*x = -(1/12*X^2-o) // : -1/3
x = (-(1/12*X^2-o))/(-1/3)
x = -3*(o-(1/12*X^2))
x = -3*(o-(1/12*X^2))
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