(A,E) =
3 2 1 1 0 0
3 1 5 0 1 0
3 2 3 0 0 1
r2-r1,r3-r1
3 2 1 1 0 0
0 -1 4 -1 1 0
0 0 2 -1 0 1
r2-2r3,r1-(1/2)r3
3 2 0 3/2 0 -1/2
0 -1 0 1 1 -2
0 0 2 -1 0 1
r1+2r2
3 0 0 7/2 2 -9/2
0 -1 0 1 1 -2
0 0 2 -1 0 1
r1*(1/3),r2*(-1),r3*(1/2)
1 0 0 7/6 2/3 -3/2
0 1 0 -1 -1 2
0 0 1 -1/2 0 1/2
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