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The given equation is:

\[
-21 = -x
\]

To solve for \( x \) using the multiplication principle, you can multiply both sides of the equation by \(-1\), which will eliminate the negative sign in front of \( x \).

\[
-1(-21) = -1(-x)
\]

This simplifies to:

\[
21 = x
\]

Thus, the solution is \( x = 21 \).

Would you like more details, or do you have any questions?

Here are some related questions you might consider:
1. How does multiplying both sides of an equation by \(-1\) affect the equation?
2. Can you solve an equation like \( -3x = 9 \) using the same method?
3. What are some other ways to isolate \( x \) in linear equations?
4. How do you check the solution of an equation?
5. What happens if you divide by zero when solving equations?

**Tip:** Always perform the same operation on both sides of the equation to maintain equality.

Solve the equation using the multiplication principle: -21 = -x

Learn how to solve the linear equation -21 = -x using the multiplication principle. This algebra problem involves eliminating negatives by multiplying both sides by -1. Suitable for Grades 6-8 students learning basic algebra.

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