for example in a 10/20 game
i have 345j
opponent q7qk
i have 35% equity, so pot needs to be 60usd, to peel profitable, if i calculated right.
now the question. can i peel ligher here, since if i hit a a,2,6,7 i would be i great shape. otherwise it would be a easy fold, if i hit k, q,....
if u would recommend to peel looser, which potsize can i peel then?

I was told there'd be no math

High or high-low?

example is for stud8

You have closer to 36% equity, and you think you need to have 60 in the pot to call a small bet of 10 on 4th profitably?
I think math on 4th is always sketchy, since you often don't get to realize your equity when bricking 5th and having to fold before showdown, while you'd be in a decent spot, if you hit a 2, 6 or A, or okay with a 7 on 5th.
Roughly said, if your outs are somewhat live, and it's not a limped pot, you should likely see 5th, and then have easy decisions on how to continue in that hand.

I hardly ever look for equity-% on 4th street (looking up equites on and past 5th, though), since opponents tendencies and your playability in that hand still count way more than some dubious equity-%, that you either don't get to realize, or improves massively on next street. On 5th, you can usually say that you are going to call down nearly all the time, if you have 4 to a low and some draw, for example. There it makes sense to look closely at the %.
On 4th, though, I'd just say that its not NL Stud8