_12 + 4n = 6(n-2)

Answer 1

12 + 4n = 6(n - 2)
12 + 4n = 6n - 12
+12 +12

24 + 4n = 6n
- 4n -4n

24 = 2n
solve for n and you've got your answer!

Answer 2

n=12