$\left(\frac{r}{5}+7,-\frac{r}{5}+35\right)$

$\left(\ -\ \frac{3r}{2}+\frac{7}{2},\ r\right)$

\(\left(r,\ \frac{2r}{3}+\frac{7}{3}\right)\)

$\left(r,-\frac{3r}{2}+\frac{7}{2}\right)$