Question: Solving linear equations

I am trying to solve several problems of  solving  around 200 undetermined variables out of a set of aroud 300 2nd-order equations (such as a*b=c).

I just use "solve" command.

1. Maple continuingly evaluates and does not return result, how to make it work? 

2. In some problems, i have results, but there are great of freedom, which i want to restrict them in some way.

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