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