Question 882806
Cramer's rule
{{{(matrix(3,3,1,-1,3,
               4,1,2,
               3,2,2))*(matrix(3,1,x,y,z))=(matrix(3,1,13,17,1))}}}
{{{A=(matrix(3,3,1,-1,3,
               4,1,2,
               3,2,2))}}}
{{{abs(A)=15}}}
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{{{A[x]=(matrix(3,3,13,-1,3,
               17,1,2,
               1,2,2))}}}
{{{abs(A[x])=105}}}
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.
.
{{{A[y]=(matrix(3,3,1,13,3,
               4,17,2,
               3,1,2))}}}
{{{abs(A[y])=-135}}}
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.
.
{{{A[z]=(matrix(3,3,1,-1,13,
               4,1,17,
               3,2,1))}}}
{{{abs(A[z])=-15}}}
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{{{x=abs(A[x])/abs(A)=105/15=7}}}
.
{{{y=abs(A[y])/abs(A)=-135/15=-9}}}
.
{{{z=abs(A[z])/abs(A)=-15/15=1}}}