Question 379751
[A]={{{(matrix(3,3,1,2,-5,2,-2,1,4,-2,3))}}}
[x]={{{(matrix(3,1,x,y,z))}}}
[b]={{{(matrix(3,1,1,2,3))}}}
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.
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[A][x]=[b]
[x]=[A]inv[b]
.
det[A]={{{-28}}}
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Using matrix inversion,
[x]={{{-(1/28)*(matrix(3,1,20,11,6))}}}