Can anyone recommend a source for learning how to 
solve equations (for any variable) using computers.  

For instance: Say one has a simple equation like:

2X + 4y + 3Z = 0  

Now the equation could have been written like
X = -(4y + 3z)/2 and that could be easily solved
for x, but if one wanted the user to be 
able to solve for any variable while entering the 
equation in any format, the problem becomes a little 
more difficult (programatically).

What is a good source of information that shows how
to handle equations that can be solved for any variable
given that the equation can be entered in any format?

Thanks

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