55 in 3bet pot

55 is ok to call preflop. You have to pay attention if there are active squeezers behind. In such case you should tighten up your calling range a bit.
After the squeeze with a caller in the pot we have the implied odds to call too.

I´m not sure about calling. If I calculate it correct we call 9bb and effective stack will be 88bb postflop. Not sure how to calculate odds to setmine in 3way but I think here we have to stack one of the player or gain 50 % from both stacks everytime we hit a set which won´t happen. Also sometimes opponent will have overset. Against it we have position and sometimes we will able to steal pot without set.

So I would fold here.

Fold flop, you'll never be good here and you won't realize your equity as they'll most likely bet turn.

We have outs still.

Preflop isn't necessarily terrible as you're closing the action and have position, but I don't think stacks a deep enough to call so I'd prefer folding. You'll find yourself in a lot of these kinds of awkard situations postflop that can just be avoided by folding pre.

It seems counter-intuitive but I would say fold flop (which is another argument for folding pre, as this is as strong as 55 ever flops without making a set) because a 6 or A on the turn kills any action and you won't get paid, plus you now don't want to make a set.

I think it's fine to call preflop, considering the price and the fact that we will be IP. We can call this flop, too.