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###
In Maple

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

**inputs ** `outputs`

** solve( {2*x1 + x2 + 3*x3 - 9 = 0, x1 - 2*x2 + x3 + 2 = 0, \
3*x1 + 2*x2 + 2*x3 - 7 = 0}, {x1, x2, x3} );
**

{x1 = -1, x2 = 2, x3 = 3}

Richard Liska