Need help with a complicated Snippet code that will have a value change at level 14. SOLVED

I've been wracking my brain over this for days now and I can't figure it out. I'm trying to use a snippet code in a homebrew subclass ability to show its range, which starts as 30 feet. At level 14 this range increases to 45 feet.

I have tried so many combinations and nothing has worked, most of the time I get an error about the rounddown part of it.

It's something like this {{30+(15*(classlevel/14@rounddown))}}.

That's just to give you all an idea of what I'm trying to achieve math wise. I appreciate any help with this.

Man, trying to solve this issue with something overly complicated and the simple answer was right under my nose... I feel dumb now. Thank you for the help.