Question 881646
{{{(matrix(2,2,2,-3,1,5))*(matrix(2,1,x,y))=(matrix(2,1,4,2))}}}
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{{{(matrix(2,1,x,y))=(1/13)*(matrix(2,2,5,3,-1,2))*(matrix(2,1,4,2))}}}
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{{{(matrix(2,1,x,y))=(matrix(2,1,2,0))}}}