You can solve for unknown variables if there is information included in order to solve for them.
Without that information, it's impossible. Don't fool yourself into thinking you are smart by presenting an impossible equation. It's only made you look more stupid than you already do, which is quite a feat.
But since you presented the challenge, know how to do the equation, and know the solution, share it with us. I have stated that I cannot do it. You obviously can, so present us with the solution. Show us you are better than me at math. Show us you do math all day every day in WAYS that are incomprehensible to us laypeople.
Don't add this to the list of challenges I have given that you have failed to meet. The list is getting too long.