WoahThere

Okay, so neither option worked whether or not I used division or multiplication for the final number. I reloaded my auto save (beginning of the tomb) and I was able to enter in the equation exactly as I did before, however this time it actually worked. If anyone comes across this bug in future, just reload the auto-save and it should work, the terminal is pretty much right there anyway so you don't have much backtracking to do.

It does not work for some people, on Xbox One digital using T3 the equation is still listed as incorrect, it is very much a bug, and those offering the answer to the maths clearly don't understand the issue being discussed here.