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# 9 (LU decomposition using Sage)
[ 3 1 2]
[-9 0 -4]
[ 9 9 14]
[0 0 1]
[1 0 0]
[0 1 0]
(
[ 1 0 0] [ -9 0 -4]
[ -1 1 0] [ 0 9 10]
[-1/3 1/9 1], [ 0 0 -4/9]
)