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Mathematics 7 Online
OpenStudy (anonymous):

Solve the equation for the given variable. rs - rt = st - sr, for r

jimthompson5910 (jim_thompson5910):

\[\large rs - rt = st - sr\] \[\large rs - rt + sr= st \] \[\large r(s - t + s)= st \] \[\large r(2s - t)= st \] \[\large r= \frac{st}{2s-t} \]

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