The incomplete work of a student to solve an equation is shown below:

Question

Step 1: 3x + 12 = 3
Step 2: ?
Step 3: x = −9 ÷ 3
Step 4: x = −3

What is the missing Step 2? (5 points)

A: 3x = 9

B: 3x = 15

C: 3x = −9

D: 3x = −15

Answer 1

A: 3x = 9