Answer:
1. Subtraction Property of Equality
2. Simplifying
3. Multiplication Property of Equality
4. Simplifying
Explanation:
1. -7 was subtracted from both sides
Reason: Subtraction Property of Equality
2. The actual subtraction of 7 took place:
Reason: Simplifying
3. Both sides are being multiplied by 3.
Reason: Multiplication Property of Equality
4. The actual multiplications were done.
Reason: Simplifying