4 0 - 1 4
- 1 2 1 0
-4 2 - 1 4
In line 2, line 3 and line 4, add lines 1 ×-2, 1/2, 2.
2 - 1 1 -2
0 2 -3 8
0 32 32 - 1
0 0 1 0
In line 3, add line 2 ×-3/4.
2 - 1 1 -2
0 2 -3 8
0 0 154 -7
0 0 1 0
Line 3 Exchange Line 4-
2 - 1 1 -2
0 2 -3 8
0 0 1 0
0 0 154 -7
In the fourth line, add the third line ×- 15/4-
2 - 1 1 -2
0 2 -3 8
0 0 1 0
0 0 0 -7
Multiply the main diagonal by 28.