[ 0 1 0]^(-1) [ 0 1 0 ]

[ 1 0 0] === [ 1 0 0 ]

[ 0 0 1] [ 0 0 1 ]

[ 1 0 0 ]^(-1) [ 1 0 0 ]

[ 0 0 1 ] =====[ 0 0 1 ]

[ 0 1 0 ] [ 0 1 0 ]

X=

[ 0 1 0] [ 1 -4 3 ] [ 1 0 0 ]

[ 1 0 0] * [ 2 0 -1 ]* [ 0 0 1 ]

[ 0 0 1] [ 1 -2 0 ] [ 0 1 0 ]

=

[ 2 -1 0 ]

[ 1 3 -4 ]

[ 1 0 -2 ]