Question

What is the solution to this equation?

x- 12 = 9
O A. =-3
O B. x=21
O c. x= 3
O D. x=-21​

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

`B. x=21`

Explanation:

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