@Jafe The best thing about "cancel stars" is that when you invoke it you get (at least I do in my web browser; details might vary?) a popup saying something like "really cancel stars?" with buttons "OK" and ... "Cancel". So if you want to cancel, be sure not to click "cancel".
Why are these two "equations" true?
L + I = 900
7 + 1 = 405
Note: They're not all super accurate, but accurate enough once you realize the method I used to make this little puzzle. No knowledge other than trivial is needed.