Calculate the Iterated Integral $\int _ { 0 } ^ { 2 } \left( \int _ { 0 } ^ { x } ( x + 2 y ) d y \right)$

Short Answer

Calculate the iterated integral $\int _ { 0 } ^ { 2 } \left( \int _ { 0 } ^ { x } ( x + 2 y ) d y \right)$ dx.
Enter just a reduced fraction of form $\frac { a } { b }$ .