Matrices & Systems · Easy problem

The invertible matrix $A$ has $A^{-1} = \begin{pmatrix}2 & 1\\1 & 1\end{pmatrix}$. The vector $x = \begin{pmatrix}x_1\\x_2\end{pmatrix}$ solves $Ax = \begin{pmatrix}3\\2\end{pmatrix}$. Find $x_1 + x_2$.