\[\frac{16 - 7x}{(x - 3)^{2}} - \frac{13 - 6x}{(3 - x)^{2}} =\]
\[= \frac{16 - 7x}{(x - 3)^{2}} - \frac{13 - 6x}{(x - 3)^{2}} =\]
\[= \frac{16 - 7x - 13 + 6x}{(x - 3)^{2}} =\]
\[= \frac{- x + 3}{(x - 3)^{2}} = \frac{- (x - 3)}{(x - 3)^{2}} =\]
\[= - \frac{1}{x - 3} = \frac{1}{3 - x}\]