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The question asks to simplify the expression:

\[
12r - 8 - 12
\]

We can combine the like terms:

1. The term \( 12r \) is left unchanged since there are no other terms involving \( r \).
2. Combine the constants: \(-8 - 12 = -20\).

Thus, the simplified expression is:

\[
12r - 20
\]

The correct answer from the given options is:

\[
\boxed{12r - 20}
\]

Would you like a deeper explanation of combining like terms or any other questions?

Here are 5 follow-up questions for further understanding:
1. How do you identify like terms in an expression?
2. Can you explain how to combine constants in more complex expressions?
3. What is the difference between coefficients and constants in algebraic expressions?
4. How does distributing work in expressions with parentheses?
5. How can you simplify expressions with multiple variables?

**Tip:** Always remember to carefully combine constants separately from variable terms when simplifying expressions!

Simplify the following expression: 12r - 8 - 12

Learn how to simplify the algebraic expression 12r - 8 - 12 by combining like terms. This problem covers essential algebra concepts suitable for students in Grades 6-8.

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