[1, 0, -1, 1, 0, 0]
[3, 1, -3, 0, 1, 0]
[1, 2, -2, 0, 0, 1]
II - 3*I ; III - I
[1, 0, -1, 1, 0, 0]
[0, 1, 0, -3, 1, 0]
[0, 2, -1, -1, 0, 1]
III - 2*II
[1, 0, -1, 1, 0, 0]
[0, 1, 0, -3, 1, 0]
[0, 0, -1, 5, -2, 1]
I - III
[1, 0, 0, -4, 2, -1]
[0, 1, 0, -3, 1, 0]
[0, 0, -1, 5, -2, 1]
III*(-1)
[1, 0, 0, -4, 2, -1]
[0, 1, 0, -3, 1, 0]
[0, 0, 1, -5, 2, -1]