Isolating r from this equation

nikkoderic:
Hi Arduino people!

Can you please isolate the variable r and simplify this equation (attached)? Don't worry it's not my homework. I tried Microsoft Mathematics to simplify but it can't. I don't have Mathematica so I can't use that.

I need this equation for my project in Arduino. I can't put it into my code. :disappointed_relieved:

Your help is appreciated. If this equation works I will share it here. :smiley:

The first you can do is to Reduct to a common denominator.