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$(r,-\frac{8r}{7}+\frac{9}{7})$
$(-\frac{8r}{7}+\frac{9}{7},r)$
\((-\frac{8r}{7}+9,\frac{8r}{7}+27)\)
$(\frac{r}{3}+9,-\frac{r}{3}+27)$
