Answer
$x=\dfrac{S}{r+s}$
Work Step by Step
Using the properties of equality, in terms of $
x
$, the given equation, $
S=rx+sx
$, is equivalent to
\begin{array}{l}
S=x(r+s)
\\\\
\dfrac{S}{r+s}=x
\\\\
x=\dfrac{S}{r+s}
.\end{array}
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