Here is the complete succession of row operations.
1
2
2
3
1
6
6 R
1
2
1
4
1
2
4 R
2
3
4
1
8
1
2
3 R
2
+ 8 R
1
3
4
1
0
35
14
1
7
R
2
3
4
1
5 R
1
4 R
2
0
5
2
15
0
3
1
15
R
1
0
5
2
1
5
R
2
1
0
1
5
0
1
2
5