The problem asks to evaluate the expression $5x$ when $x = 6$. Here's the step-by-step solution:

1. Start with the expression:
   $5x$

2. Substitute $x = 6$ into the expression:
   $5(6)$

3. Multiply $5$ by $6$:
   $5 \times 6 = 30$

Final Answer:
$5x = 30 \text{ when } x = 6.$

Would you like further explanation or have any related questions?

5 Related Questions:

1. What happens if $x = -6$ in the same expression?
2. How would the result change if the coefficient of $x$ were 7 instead of 5?
3. Can you solve for $x$ if $5x = 50$?
4. What does the expression look like if you add 3 to $5x$ before substituting $x = 6$?
5. How is this type of problem related to the concept of linear equations?

Tip:

Always substitute the given value directly into the variable and carefully follow the order of operations!