To solve the expression $x + 8$ for a specific value of $x$, you need to set it equal to a solid number, creating an equation. For example, if you want to solve $x + 8$ to a solid number like 15, you would set up the equation:

$x + 8 = 15$

Steps to Solve:

1. Subtract 8 from both sides of the equation to isolate $x$:

   $x + 8 - 8 = 15 - 8$

2. Simplify the equation:

   $x = 7$

So, $x = 7$ is the solution.

You can replace 15 with any other number you want, and follow the same steps to solve for $x$.

Would you like to try solving a similar equation, or do you have another question?

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Here are 5 related questions to explore further:

1. How would you solve $x + 8 = 20$?
2. If you had $2x + 8 = 15$, how would the solution process change?
3. What happens if the equation is $x + 8 = 0$?
4. How can you check if your solution for $x$ is correct?
5. Can you solve $x + 8 = 3x + 5$ and find the value of $x$?

Tip: Always double-check your solution by substituting it back into the original equation to ensure it satisfies the equation.