\[\left( 3x^{\backslash x + 5} - \frac{6x}{x + 5} \right)\ :\frac{9x + 27}{8x + 40} =\]
\[= \frac{3x(x + 5) - 6x}{x + 5}\ :\frac{9 \cdot (x + 3)}{8 \cdot (x + 5)} =\]