\[\frac{x - 3}{3(x + 2)} - \frac{x - 6^{\backslash 3}}{x + 2} =\]
\[= \frac{x - 3 - x + 18}{3(x + 2)} =\]
\[= \frac{15}{3(x + 2)} = \frac{5}{x + 2}.\]