The equation you've provided is:

$-B + a = 8$

To solve this equation, we can express one variable in terms of the other. Let's solve for $a$:

$a = B + 8$

Thus, $a$ is equal to $B + 8$.

Would you like more details on how we arrived at this result or have any further questions? Here are some related questions you might find interesting:

1. What would happen if we solve for $B$ instead of $a$?
2. How does solving for variables in linear equations help us understand their relationship?
3. What are some real-world situations where such an equation might arise?
4. How would you graph this equation if we had a specific value for $B$?
5. Can you solve a similar equation involving more variables?

Tip: When solving for a variable in an equation, try isolating it by performing the same operation on both sides.