6(1n4-4n3+3n)
Explanation:
6 is the lcm of 6,24, and 18. So you will then do 6 divided by 6, 24 divide by 6, and 18 divided by 6. Then replace 6 with your answer, 24 with your answer, and 18 with your answer.
Its not the best explanation but its the best I can do.
