Сократите дробь: (49-n^2)/(n^2-14n+49).

\[\frac{49 - n^{2}}{n^{2} - 14n + 49} =\]

\[= \frac{(7 - n)(7 + n)}{(7 - n)^{2}} = \frac{7 + n}{7 - n}.\]