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