The expression you've provided is $(4 - z) \times x$.

To simplify this, you can distribute $x$ across the expression inside the parentheses:

$(4 - z) \times x = 4x - zx$

So, the simplified expression is:

$4x - zx$

Would you like further details on how this works, or do you have any specific questions?

Here are 5 related questions you might find interesting:

1. What happens if $z = 2$ in the expression $4x - zx$?
2. How would you factor the expression $4x - zx$?
3. What is the result if $x = 0$ in the expression $4x - zx$?
4. How does the expression change if you replace $z$ with $2z$?
5. What is the value of the expression when $x = 1$ and $z = 3$?

Tip: Always double-check your work when distributing variables to avoid errors!