Solving for variable

[bicycletorch]

It's been quite a while since Algebra, so I was hoping I could get a bit of help solving the following for R₂:

 

[Ishuda]

Nothing is showing up for me other than the "It's been quite a while since Algebra, so I was hoping I could get a bit of help solving the following for R₂:"

So, making up 'the following', R₂ is \(\displaystyle e^{i \pi}\)

 

[stapel]

I was hoping I could get a bit of help solving the following for R₂:

Please reply with a typed-out statement of the exercise, or at least with a link to a server which is not password-protected. (Nobody here is going to try to hack a server for you. Sorry.)