Question 259603
Is a matrix solution OK? You didn't specify.
[A]={{{(matrix(3,3,4,-1,1,2,2,3,5,-2,6))}}}
[x]={{{(matrix(3,1,x,y,z))}}}
[B]={{{(matrix(3,1,5,-10,-1))}}}
[A]inv={{{(1/55)*(matrix(3,3,
18,4,-5,
3,19,-10,
-14,3,10))}}}
[x]=[A]inv[B]
[x]={{{(matrix(3,1,1,-3,-2))}}}