666

Usage: ((User:Saintrain/A/NegTest|SomeNumericString)).

This template attempts to evaluate the numeric string.

So: ((NegTest|100 -1)) (using a hyphen) returns 99;
((NegTest|100 −2)) (using a markup minus) returns 98;
((NegTest|100 −3)) (using a literal minus) returns 97.