Posted by **Sab** on Tuesday, August 28, 2012 at 11:19am.

Rearrange (r+s)/8s=(r-s)/8n to make r the subject.

OK, I have started by rearranging the formula:

8n(r+s)=8s(r-s)

8nr+8ns=8sr-8s^2

What do I do next?

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