3-2r1,r4-r1,r6+r1
1 1 -1 1 0
0 0 1 1 1
0 0 1 -2 1
0 0 -1 -1 -1
0 0 2 -4 2
0 0 1 -2 1
r6-r3,r5-2r3,r4+r2,r3-r2,r1+r2
1 1 0 2 1
0 0 1 1 1
0 0 0 -3 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
r3*(-1/3),r1-2r3,r2-r3
1 1 0 0 1
0 0 1 0 1
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0