Question

What is the solution to this equation?

Answer 1

B.
You add +12 to both sides and the left side cancels out, leaving X. Then 9+12=21. So X=21

Answer 2

Answer:

$B. x=21$

Step-by-step explanation:

$x- 12 = 9 \\ x = 12 + 9 \\ x = 21$