Matrix Hand

Matrix Hand How to do a matrix (by hand)? Or is it like, impossible to do it without a calculator? An Example I have is : -x-3y-2z=1 3x+2y-z=-3 -2+y-3z=8 Then you do the bracket thing — | -1 -3 -2 | 3 2 -1 | -2 1 -3 — and — |-10 |-10 |-5 — [...]