Short of writing my own plugin to do so, does there exist a mechanism with which I can add/subtract from multiple selected numbers?
I need to apply the same equation (in this case, subtract 5) to many values; and I'd rather not do it individually. Could this perhaps be a job for another program?
If you already use Emmet (which I highly suggest), use its Evaluate Math function. No need to install more plugins. Only issue is that it cuts the result at 2 decimal digits.