Solución 1
\[5x^2 + 4x - 12=0\]
\[x = \boxed{(\frac{6}{5}, -2)}\]
Solución 2
\[4x^2 - 5x - 51=0\]
\[x = \boxed{(\frac{17}{4}, -3)}\]
Solución 3
\[x^2 - 2x - 24=0\]
\[x = \boxed{(6, -4)}\]
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