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The given problem is to evaluate \( 7a \) when \( a = -3 \).

To solve this:

\[
7a = 7 \times (-3) = -21
\]

So, the answer is \( -21 \).

Would you like more details or have any further questions? Here are 5 related questions to expand on this concept:

1. What happens when we evaluate \( -7a \) when \( a = -3 \)?
2. How do you evaluate expressions when both variables and constants are involved?
3. What is the general rule for multiplying a positive number by a negative number?
4. Can you solve \( 7a + 4 \) when \( a = -3 \)?
5. What happens if we set \( a = 0 \)? How does this affect the evaluation of \( 7a \)?

**Tip:** Always apply the correct sign when multiplying negative numbers to avoid mistakes.

This problem involves basic algebra, focusing on the evaluation of 7a when a is equal to -3. Learn how to solve this multiplication-based algebraic expression, which involves understanding the rules for multiplying positive and negative numbers. Suitable for students in Grades 6-8.

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