I am supposed to solve this problem using the Gauss elimination method: 2x+y+2z=5
3x+2z=2
-4x+6y-z=3
I did the problem, but got -5/7 for z, and the answers are all supposed to be integers. Any idea where I went wrong?

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Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20