$\displaystyle -\dfrac{\sqrt{39}}{7}$\displaystyle -\dfrac{\sqrt{39}}{7}

$\displaystyle \dfrac{\sqrt{39}}{7}$\displaystyle \dfrac{\sqrt{39}}{7}

$\displaystyle -\frac{5}{7}$\displaystyle -\frac{5}{7}

$\displaystyle - \frac{\sqrt{10}}{7}$\displaystyle - \frac{\sqrt{10}}{7}