SOLUTION: S=a/(a-r). solve for r. and why?

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Question 500491: S=a/(a-r). solve for r. and why?
Answer by chessace(471) About Me  (Show Source):
You can put this solution on YOUR website!
Because you might be given S and a and need to find r.
:) or maybe you mean "how?".
Sa-Sr=a
Sr=Sa-a
r = a(S-1)/S