I m trying to determine my partner's equity percentage of an LLC.
It will be whatever it takes to get you out from under this arrangement without spending barrels full of money on attorney fees if your partner decides to litigate.

All you can do is pick a number ($____) and see if your partner can live with it.

Or ask your partner for a number ($____)and see if you can live with it.

All the advice in the world is not going to resolve anything until one you puts a number out there.