12(2)+(x+6)(2) = 64
12(2) = 24
Distribute the (x+6)(2)= 2x + 12
New equation:
24 + 2x + 12 = 64
Solve for x, and you will get x = 14
Then put that back in to (x+6). 14 plus 6 equals 20. Which L = (x+6)
L = 20
20 is your final answer.
I hope this helped!!
