Let's simplify the expression:

\[
4x - 2x - 20x + z
\]

### Combine like terms (the terms with \( x \)):

\[
(4x - 2x - 20x) + z = (4 - 2 - 20)x + z = -18x + z
\]

So, the simplified expression is:

\[
-18x + z
\]

Would you like more details or have any questions?

Here are 5 related questions for further practice:
1. Simplify the expression: \( 5x + 3x - 7x + y \).
2. Factor the expression: \( 18x + 27 \).
3. Solve for \( x \) in the equation: \( 4x - 20 = 8 \).
4. Evaluate \( -18x + z \) when \( x = 2 \) and \( z = 5 \).
5. Expand the expression: \( (x + z)(3 - 4x) \).

**Tip:** Always combine like terms first when simplifying expressions. This helps you reduce the equation to its simplest form.

Simplify the algebraic expression 4x - 2x - 20x + z with step-by-step guidance. Learn how to combine like terms and reduce the expression to its simplest form. This problem focuses on key algebraic concepts suitable for students in Grades 6-8.

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