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###
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]]

Richard Liska