Two forces, represented by the vectors $\vec F_1 = -6\,\mathit{\vec i}+2\,\mathit{\vec j}$ and $\vec F_2 = -3\,\mathit{\vec i}+7\,\mathit{\vec j}$, are acting on an object. Give a vector $\vec F_3$ representing the force that must be applied to the object if it is to remain stationary.

$\vec F_3 =$