Linear systems

 

In Macsyma

For comparison with other CAS choose from: Axiom Derive Maple Mathematica Reduce

inputs outputs

    solve([2*x1+x2+3*x3-9, x1-2*x2+x3+2, 3*x1+2*x2+2*x3-7], [x1, x2, x3]);

                     [[x1 = - 1, x2 = 2, x3 = 3]]