SOLUTION: E/e=(R+r)/(R-r) solve for r

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Question 1097131: E/e=(R+r)/(R-r) solve for r
Found 2 solutions by Fombitz, ikleyn:
Answer by Fombitz(32388) About Me  (Show Source):
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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Below find the  CORRECT  solution. 

E%28R-r%29 = e%28R%2Br%29

ER-Er = eR%2Ber

-er-Er = -ER%2BeR

-r%28e%2BE%29 = R%28-E%2Be%29

r%28e%2BE%29 = R%28E-e%29

r = R%28%28E-e%29%2F%28E%2Be%29%29