Question 312366
Are matrix methods OK?
I found the inverse of the coefficient matrix and multiplied it by the right hand side.
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[A][x]=[b]
[A]inv[A][x]=[A]inv[b]
[x]=[A]inv[b]
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where 
[A]={{{(matrix(3,3,3,2,-1,-3,4,5,1,-3,4))}}}
[x]={{{(matrix(3,1,x,y,z))}}}
[b]={{{(matrix(3,1,8,-14,-14))}}}
to get
[x]={{{(matrix(3,1,1,1,-3))}}}