Answer:
r = st/(x - 1)
Explanation:
So first add and subtract so that the r terms are only on one side of the equation.
rx - st = r
+st +st
rx = r + st
-r -r
rx - r = st Then factor out r.
r(x - 1) = st Then divide by (x-1) to get the r all by itself.
r(x - 1)/(x-1) = st/(x-1)
r = st/(x - 1)
r is s times t over x-1