Solve for s.

To solve for \( s \) in the equation \( 4 + (-8 + s) = 20 \), we can simplify the expression step-by-step.

1. Rewrite the equation:
\[
4 - 8 + s = 20
\]

2. Combine the constants \( 4 \) and \( -8 \):
\[
-4 + s = 20
\]

3. Add \( 4 \) to both sides to isolate \( s \):
\[
s = 20 + 4
\]

4. Simplify:
\[
s = 24
\]

Thus, the solution is:
\[
s = 24
\]