
A = [ 22, 10,  2,  3,  7; ...
      14,  7, 10,  0,  8; ...
      -1, 13, -1,-11,  3; ...
      -3, -2, 13, -2,  4; ...
       9,  8,  1, -2,  4; ...
       9,  1, -7,  5, -1; ...
       2, -6,  6,  5,  1; ...
       4,  5,  0, -2,  2;];


b = [  0; ...
       1; ...
      11; ...
       4; ...
      -6; ...
       3; ...
      12; ...
      -5;];