Упростите выражение: (7/k-3)/(4-(7+k)/k).

\[\frac{\frac{7}{k} - 3^{\backslash k}}{4^{\backslash k} - \frac{7 + k}{k}} = \frac{\frac{7 - 3k}{k}}{\frac{4k - 7 - k}{k}} =\]

\[= \frac{7 - 3k}{k} \cdot \frac{k}{3k - 7} = - 1.\]