Answer:
Option A =- 3x + 6 = 12; Distributive Property
Explanation:
Given : Expression

To find : Fill in the missing work and justification for step 2 when solving expression ?
Solution :
Step Work Justification
1
Given
2
Distributive Property
3
Subtraction Property of Equality
4
Simplify
5
Division Property of Equality
6
Simplify
Therefore, option A is correct.