doing Gaußalgorithm within Math

[Catscrash]

Hi,
i think all of you know the gaußalgorithm to solve problems like

2x_1 + 3x_2 + 4x_3 = 1
x_1 + 2_x_2 + 6x_3 = 3
8x_1 + 4x_2 + 3x_3 = 4

or sth. like that, it looks then like

2 3 4 | 1
1 2 6 | 3
8 4 3 | 4

i would like to display that in a nice way with left( right) around it and a long dash where all the small ones are now, has anyone of you an idea how to do this?

[RGB]

Try with the following:

Code: Select all

left( matrix{a # b ## c # d ## e # f } mline matrix{g ## h ## i} right)

NOTE: you can use stack instead of matrix for the right part, but there will be alignment problems.