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2 1 -1 1 0 0
2 1 0 0 1 0
1 -1 1 0 0 1
=
3 0 0 1 0 1
0 3 -2 0 1-2
1 -1 1 0 0 1
=
1 0 0 1/3 0 1/3
0 3 -2 0 1 -2
0 -1 1-1/3 0 2/3
=
1 0 0 1/3 0 1/3
0 1 0-2/3 1 -2/3
0 -1 1-1/3 0 2/3
=
1 0 0 1/3 0 1/3
0 1 0-2/3 1 -2/3
0 0 1-1 1 0
A-=
1/3 0 1/3
-2/3 1 -2/3
-1 1 0
X=
1 -1 3 1/3 0 1/3
4 3 2 x -2/3 1 -2/3
1 -2 5 -1 1 0
=
-2 2 1
-8/3 5 -2/3
-10/3 3 5/3