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**Gauss-Jordan Elimination Method Help!!!**

Hi, I'm having a problem solving the following using the Gauss-Jordan Elimination Method. I am wondering if someone can help me...

i.e.2x + 5y - z = -3

x - y + 4z = 20

3x + 2y - z = 3

Code:

```
[ [2 5 -1 -3]
[1 -1 4 20]
[3 2 -1 3]]
```

Code:

```
[ [1 -1 4 20]
[0 7 9 -43]
[0 5 -13 -57]]
```