To solve the equation $5 = a - 8$ for $a$, follow these steps:

1. Start by isolating $a$ on one side of the equation. To do this, add 8 to both sides: $5 + 8 = a - 8 + 8$

2. Simplify: $13 = a$

So, $a = 13$.

Would you like further details or have any other questions?

Here are 5 related questions to explore:

1. Solve $7 = b - 9$ for $b$.
2. What is the solution to $10 = c - 5$?
3. If $x - 4 = 3$, what is the value of $x$?
4. Solve $m - 12 = 18$ for $m$.
5. How would you solve $15 = p - 7$ for $p$?

Tip: When solving linear equations, always aim to isolate the variable by performing inverse operations (like adding when subtracting or vice versa).