Calculate $\int_C ((3 x + 3 y)\,\vec i + (7 x + 6 y)\,\vec j)\cdot d\vec r$ where $C$ is the circular path with center $(a, b)$ and radius $m$, oriented counterclockwise. Use Green's Theorem.

$\int_C ((3 x + 3 y)\,\vec i + (7 x + 6 y)\,\vec j)\cdot d\vec r =$