Answer:

Step-by-step explanation:
Given the equation

1. Use Addition property of equality, add -7 to both sides:

2. The absolute value of the number is 0 if and only if the number is 0, so

3. Use Addition property of equality, add -9 to both sides:

4. Use Division property of equality, divide both sides by 3:

Answer:
The answer is step 5
Step-by-step explanation:
flip the sign