Solving Large Systems of Equations

[MattH]

What is the best way to solve a system with 6 variables and 6 equations? I have been using solve([equation1 equation2 equation3],[x y z]) in CAS for smaller ones and it works pretty good most of the time but I just tried doing a 6x6 and I got the error message "double_deux_points(CAS,solve([stuff I entered])), probably user error but I'm also just wondering if there is a more efficient way. I'd like to save as much time as possible.