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Liberal healthcare system

It´s a system where the majority of the citizens have not obtain healthcare by their own means, specially subscribing private insurance and only some of them are insuranced by the public Administration.

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Quadratic formula

... reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, because it ...