....add times the 1st row to the 2nd row =>
Row operation
2:
.........add times the 1st row to the 3rd row...=>
Row operation
3:
..............multiply the 2nd row by ...=>...
Row operation
4:
....add times the 2nd row to the 3rd row..=>...
Row operation
5:
...........add times the 3rd row to the 2nd row...=>...
Row operation
6:
.....add times the 3rd row to the 1st row...>...
Row operation
7: ....add times the 2nd row to the 1st row...=>...