more test equations
Squashed 'src/lib/JS-Algebra/' changes from bb80ae5..15e91fc

15e91fc Negative numbers exist.

git-subtree-dir: src/lib/JS-Algebra
git-subtree-split: 15e91fcf4af07a6f8b5a267968b2420e81173671
Merge commit '1e5001321d0232e8c25646fb5cb1e78bc152f85e'