Question 877227
{{{(matrix(3,3,7,-1,-1,10,-2,1,6,3,-2))*(matrix(3,1,X1,X2,X3))=(matrix(3,1,0,8,7))}}}
{{{A= (matrix(3,3,7,-1,-1,
                10,-2,1, 
                 6,3,-2))}}}
{{{abs(A)=-61}}}
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{{{A[x]=(matrix(3,3,0,-1,-1,
                    8,-2,1, 
                    7,3,-2))}}}
{{{abs(A[x])=-61}}}
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{{{A[y]=(matrix(3,3,7,0,-1,
                10,8,1, 
                 6,7,-2))}}}
{{{abs(A[y])=-183}}}
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{{{A[z]=(matrix(3,3,7,-1,0,
                 10,-2,8, 
                 6,3,7))}}}
{{{abs(A[z])=-244}}}
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{{{x=abs(A[x])/abs(A)=-61/-61=1}}}
{{{y=abs(A[y])/abs(A)=-183/-61=3}}}
{{{z=abs(A[z])/abs(A)=-244/-61=4}}}