I added subtraction/negation. I feel fairly confident that everything should work, but i would like people to try different addition / subtraction equations and see if anything breaks
To subtract two numbers you can use "A-B" or "A+ (small negation sign) B"
Multiple terms don't work yet.
Since output isn't trimmed, you might see something like: "-0", "00XX" or "X.XXX000".
Only addition and negation/subtraction implemented!
Also sause is in download.