Solución al ejercicio 7621

\left\{\left(\frac{\sqrt{6}}{6},\frac{\sqrt{6}}{6},\frac{\sqrt{6}}{6}\right),\left(-\frac{\sqrt{6}}{6},\frac{\sqrt{6}}{6},\frac{\sqrt{6}}{6}\right),\left(\frac{4}{5},\frac{1}{5},-1\right)\right\}