Question 1120512
If {{{p = q (r - 1/s)}}}, find r. 
distribute the q
{{{p = rq - q/s}}}
{{{p + q/s = rq}}}
divide both sides by q
{{{p/q + q/(qs) = r}}}}
cancel q
{{{p/q + 1/s}}} = r
or
r = {{{p/q + 1/s}}}