Some symbols and numbers are missing. I assume the system is supposed to read
2x - y + 2z + w = -3
x + 2y - 3z + w = 12
3x - y - z + 2w = 3
-2x + 3y + 2z - 3w = -3
In matrix form, this is

which we can strip down to the augmented matrix,
![\left[\begin{array}c2&-1&2&1&-3\\1&2&-3&1&12\\3&-1&-1&2&3\\-2&3&2&-3&-3\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/gl60vgtywodhi507mcu29i5u2e6bfwg4ww.png)
Now for the row operations:
• swap rows 1 and 2
![\left[\begin{array}cccc1&2&-3&1&12\\2&-1&2&1&-3\\3&-1&-1&2&3\\-2&3&2&-3&-3\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/xgdl7ztejah797ydy3wk98uwouywor3qyw.png)
• add -2 (row 1) to row 2, -3 (row 1) to row 3, and 2 (row 1) to row 4
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&-7&8&-1&-33\\0&7&-4&-1&21\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/rcre9nkwzeqow99pbjsgjpl9j1ngmbn167.png)
• add 7 (row 2) to -5 (row 3), and row 3 to row 4
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&16&-2&-24\\0&0&4&-2&-12\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/giq2wieviiq01f5fc03axkxkk92rns771z.png)
• multiply through rows 3 and 4 by 1/2
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&8&-1&-12\\0&0&2&-1&-6\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/4hoj7srdjprdfudtmkd5s232hws1z14xha.png)
• add -4 (row 4) to row 3
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&0&3&12\\0&0&2&-1&-6\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/mmud1z6m2ex27qop8bwy5sxfx60w9z727j.png)
• swap rows 3 and 4
![\left[\begin{array}cccc1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&2&-1&-6\\0&0&0&3&12\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/vw016ul3sr23x9gvzw6c4x6c7ov6sobdrt.png)
• multiply through row 4 by 1/3
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&2&-1&-6\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/tzx4bnqc3dezootkykjroggpcz9hpbzkgi.png)
• add row 4 to row 3
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&2&0&-2\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/kx95xpalc45r6pq7g3s4ayuelzos6q032n.png)
• multiply through row 3 by 1/2
![\left[\begin{array}c1&2&-3&1&12\\0&-5&8&-1&-27\\0&0&1&0&-1\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/g55em8a6ogs7zyww1hg1hsb68grwr6yhc3.png)
• add -8 (row 3) and row 4 to row 2
![\left[\begin{array}cccc1&2&-3&1&12\\0&-5&0&0&-15\\0&0&1&0&-1\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/khv21wu8kvrkn5ym6ya348u6fsw4rfbz1m.png)
• multiply through row 2 by -1/5
![\left[\begin{array}cccc1&2&-3&1&12\\0&1&0&0&3\\0&0&1&0&-1\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/pgkjsq0tcnaec77h4htqvwo8wcmbxoq2q0.png)
• add -2 (row 2) and 3 (row 3) and -1 (row 4) to row 1
![\left[\begin{array}c1&0&0&0&-1\\0&1&0&0&3\\0&0&1&0&-1\\0&0&0&1&4\end{array}\right]](https://img.qammunity.org/2022/formulas/mathematics/college/bkcxq3is696ktxqvql4y5zj7iuxnilensr.png)
Then the solution to the system is (x, y, z, w) = (-1, 3, -1, 4).