\[x - (4x - 11) + (9 - 2x) =\]
\[= x - 4x + 11 + 9 - 2x =\]
\[= - 5x + 20.\]
\[10 - 9\left( a - \frac{2}{3} \right) + 5a - 16 =\]
\[= 10 - 9a + 9 \cdot \frac{2}{3} + 5a - 16 =\]
\[= - 4a - 6 + 6 = - 4a.\]