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the system of equations can be written in a matrix form:
5 5 -5
3 4 -7
0 2 -8
-2 -3 6

Hi princessanna, it doesn't matter if the matrix is square or not, it is still applicable.

Well I don't know how to do the method :( because I only know the way when all the 1's are diagonal?

Yes that would be great, thank you :)

It's pretty hard to read and understand :(

Is it better now? Do they helpful to you?