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António de Oliveira Salazar (1889 - 1970) effectively functioned as the ruler of Portugal from 1932 to 1968.
... \right) x + \frac{c}{a}=0 </math> which is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form in which we ...