Payam, this is a good puzzle, but the code in the template and the test suite gives away the answer. I suggest removing the code from the template and checking the validity of the answer by applying the rules to rows, columns, and 3x3 squares.
Solve the set of simultaneous linear equations
Replicate elements in vectors
Basics: 'Find the eigenvalues of given matrix
Find the nearest integer
03 - Matrix Variables 2
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