Let's solve the equation step by step:
Given: \[ -3x - 9 = -21 \]
Step 1: Add 9 to both sides of the equation. \[ -3x - 9 + 9 = -21 + 9 \] This simplifies to: \[ -3x = -12 \]
Step 2: Divide both sides of the equation by -3. \[ x = \frac{-12}{-3} \] This simplifies to: \[ x = 4 \]
So, filling in the correct numbers in the solution:
- For the first blank (after \( -3x = \)), the answer is \(-12\).
- For the second blank (after \( x = \)), the answer is \(4\).
Final filled solution:
- \(-3x = -12\)
- \(x = 4\)