Question 362877
[A]={{{(matrix(2,2,2,-7,-1,4))}}}
[B]={{{(matrix(2,2,-21,3,12,-2))}}}
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[A][X]=[B]
[X]=[A]inv[B]
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det[A]={{{1}}}
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[A]inv={{{(matrix(2,2,4,7,1,2))}}}
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[X]=[A]inv[B]={{{(matrix(2,2,0,-2,3,-1))}}}