If $2 X+\left[\begin{array}{ll}1 & 2 \\ 3 & 4\end{array}\right]=\left[\begin{array}{ll}3 & 8 \\ 7 & 2\end{array}\right]$, then $X$ is $\_\_\_\_$.
- $\left[\begin{array}{ll}2 & 5 \\ 5 & 3\end{array}\right]$
- $\left[\begin{array}{cc}-1 & 3 \\ 2 & -1\end{array}\right]$
- $\left[\begin{array}{cc}1 & 3 \\ 2 & -1\end{array}\right]$
- $\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
