\[\boxed{\text{5.217.}}\]
\[\textbf{а)}\ \frac{x}{7} = 13\]
\[x = 13 \cdot 7\]
\[x = 91.\ \]
\[Ответ:91.\]
\[\textbf{б)}\ \frac{144}{k} = 12\]
\[k = 144\ :12\]
\[k = 12\text{.\ }\]
\[Ответ:12.\ \]
\[\textbf{в)}\ \frac{m}{13} = 27\]
\[m = 27 \cdot 13\]
\[m = 351.\ \]
\[Ответ:351.\ \]
\[\textbf{г)}\ \frac{603}{y} = 67\]
\[y = 603\ :67\]
\[y = 9.\ \]
\[Ответ:9.\]