Let's simplify the expression \( pq - p + q - 20 - 3p \).

1. Combine like terms:
   - The terms involving \( p \) are: \( -p \) and \( -3p \).
   - Combine them: \( -p - 3p = -4p \).

So, the expression becomes:
\[
pq - 4p + q - 20
\]

This is the simplified form of the expression.

Would you like further clarification or details on any part of this?

### Related Questions:
1. How do you factor expressions with multiple variables like \( pq - 4p + q - 20 \)?
2. What are common techniques for simplifying algebraic expressions?
3. How do you group terms in an expression for factoring?
4. What is the difference between terms involving a product of variables (like \( pq \)) and single-variable terms (like \( p \))?
5. How do constants affect the simplification process of expressions?

**Tip:** Always look for like terms first when simplifying any expression to avoid errors.

Learn how to simplify the algebraic expression pq - p + q - 20 - 3p by combining like terms and applying basic algebraic techniques. This problem introduces key concepts of algebraic simplification and is suitable for students in Grades 6-8.

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