Ejercicio 1
\[x^2 - x - 6=0\]
\[x = \mathbf{?}\]
Ejercicio 2
\[x^2 - x - 20=0\]
\[x = \mathbf{?}\]
Ejercicio 3
\[-5x^2 - 5x + 150=0\]
\[x = \mathbf{?}\]

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