$$\left. \begin{array} { l } { 4 x ( 8 x + 3 ) } \\ { 6 x ( x ( x + 3 ) + 2 ) + 2 x \times ( 5 + 4 ) } \\ { 6 x ( x + 3 ) + 2 x \times ( 5 + 4 ) } \\ { 9 x - 120 + 5 x = 2 20 } \\ { \text { 3 \right.$$
