[1, 1, -1, 1, 0, 0]
[0, 2, 3, 0, 1, 0]
[2, 1, 1, 0, 0, 1]
III - 2*I
[1, 1, -1, 1, 0, 0]
[0, 2, 3, 0, 1, 0]
[0, -1, 3, -2, 0, 1]
2*III + II
[1, 1, -1, 1, 0, 0]
[0, 2, 3, 0, 1, 0]
[0, 0, 9, -4, 1, 2]
9*I + III ; 3*II - III
[9, 9, 0, 5, 1, 2]
[0, 6, 0, 4, 2, -2]
[0, 0, 9, -4, 1, 2]
2*I - 3*II
[18, 0, 0, -2, -4, 10]
[0, 6, 0, 4, 2, -2]
[0, 0, 9, -4, 1, 2]
I/18 ; II/6 ; III/9
[1, 0, 0, - 1/9, - 2/9, 5/9]
[0, 1, 0, 2/3, 1/3, - 1/3]
[0, 0, 1, - 4/9, 1/9, 2/9]