Question 863666
{{{(matrix(2,2,4,-7,1,8))-(matrix(2,2,x[1],x[2],x[3],x[4]))=(matrix(2,2,-9,4,-1,5))}}}
{{{(matrix(2,2,x[1],x[2],x[3],x[4]))=(matrix(2,2,4,-7,1,8))-(matrix(2,2,-9,4,-1,5))}}}
{{{(matrix(2,2,x[1],x[2],x[3],x[4]))=(matrix(2,2,4-(-9),-7-4,1-(-1),8-5))}}}
{{{(matrix(2,2,x[1],x[2],x[3],x[4]))=(matrix(2,2,13,-11,2,3))}}}