augmented matrix in overleaf code example

Example: augmented matrix in overleaf

$$
\begin{bmatrix}
    1 & 0 & 0 & 0 &\bigm| & 0 \\
    0 & 1 & 0 & 0 &\bigm| & 5 \\
    0 & 0 & 1 & 0 &\bigm| & -4 \\ 
    0 & 0 & 0 & 1 &\bigm| & -2
\end{bmatrix}
$$