Question 1095157
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AX = B,

where A is the matrix   A = {{{(matrix(2,2, 11, -12, 5, 12))}}},  

B is the vector of the right side  B = {{{(matrix(2,1,7,-7))}}}

and  X = {{{(matrix(2,1,x,y))}}} is the vector of unknowns.
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