Jade solved the following equation:

3 + 5x – 7 = 3x – 9


Step Work Justification
1 5x + 3 – 7 = 3x – 9 Commutative propertyof addition
2 5x – 4 = 3x – 9 Addition property of equality
3 2x – 4 = –9 Subtraction property of equality
4. 2x = –5. Addition property of equality
5. x = –2.5. Division property of equality


Which step has an incorrect justification?
Step 4
Step 3
Step 2
Step 1