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Lineqpp 0.5 has been released on LuaForge.  The Linear Equations
Preprocessor solves linear equations and then substitutes the
solutions into a document at prescribed locations.  It can be used
with SVG to specify the position of graphics objects using a set of
linear equations.

Lua turns out to be a perfect match for this program.  The C code
scans and parses text, and Lua does the rest.  The Lua code is concise
and straightforward.  It's just 568 lines of code.