#+NAME: sys5
   #+HEADER: :exports both
   #+BEGIN_SRC maxima :results raw
     programmode: false;
     solution: triangularize(coefmatrix(
     [ -3*x - 11*y + 7*z = 0,
        2*x +  6*y - 2*z = 0,
          x +  2*y +   z = 0],
          [x, y, z]));
     print(solution);
   #+END_SRC

   # (1)
   #+RESULTS: sys5
   : [ - 3  - 11   7  ]
   : [                ]
   : [  0    4    - 8 ]
   : [                ]
   : [  0    0     0  ]
   # (2)
   #+BEGIN_EXAMPLE
     [ - 3  - 11   7  ]
     [                ]
     [  0    4    - 8 ]
     [                ]
     [  0    0     0  ]
   #+END_EXAMPLE

   Triangulated matrix of the above solution dosn't have pivot in the third
   column, thus it doesn't have a unique solution.