SOLUTION: How do I solve the equation 1/R = 1/r1 + 1/r2 for r2?

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Question 1073910: How do I solve the equation 1/R = 1/r1 + 1/r2 for r2?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1%2FR=1%2Fr%5B1%5D%2B1%2Fr%5B2%5D
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1%2Fr%5B2%5D=1%2FR-1%2Fr%5B1%5D
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r%5B2%5D=1%2F%281%2FR-1%2Fr%5B1%5D%29
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r%5B2%5D=%28R%2Ar%5B1%5D%29%2F%28r%5B1%5D-R%29