Question 317368
[A]={{{(matrix(3,3,2,1,0,0,3,1,1,0,-1))}}}
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det[A]={{{-5}}}
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[A]inv={{{-(1/5)*(matrix(3,3,-3,1,1,1,-2,-2,-3,1,6))}}}

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[A]={{{(matrix(3,3,1,0,2,-1,1,0,3,0,4))}}}
[x]={{{(matrix(3,1,x,y,z))}}}
[b]={{{(matrix(3,1,8,4,-6))}}}
det[A]={{{-2}}}
[A]inv={{{-(1/2)*(matrix(3,3,4,0,-2,4,-2,-2,-3,0,1))}}}
[x]={{{(matrix(3,1,-22,-18,15))}}}