Start by isolating the denominator \( p(r+s) \) in the equation:
\[
n = \frac{L}{p(r+s)}
\]
Multiply both sides by \( p(r+s) \) to eliminate the denominator:
\[
n \cdot p(r+s) = L
\]
Step 2: Solve for \( r+s \)
Divide both sides by \( n \cdot p \) to isolate \( r+s \):
\[
r+s = \frac{L}{n \cdot p}
\]
Step 3: Solve for \( s \)
Subtract \( r \) from both sides to solve for \( s \):
\[
s = \frac{L}{n \cdot p} - r
\]