Question 1120512
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If p = q (r - 1/s), find r.
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You want r. 
Undo everything that was done to r.


{{{p/q=r-1/s}}}

{{{p/q+1/s=r}}}

{{{highlight(r=p/q+1/s)}}}--------or use simple fraction skills to put into single rational expression if you want.