Сократите дробь: (c^3-7c^2d)/(7d^3-cd^2).

\[\frac{c^{3} - 7c^{2}d}{7d^{3} - cd^{2}} = \frac{c^{2}(c - 7d)}{d^{2}(7d - c)} = - \frac{c^{2}}{d^{2}}\]