18, 9, 12, 15

There are four bags of marbles. One of them contains 18, one of them contains 9, one contains 12, and the other one contains 15 marbles.

If I remove three marbles (must be three) and distribute one each of the other bags, that would be ONE move. How many moves would I have to make to evenly distribute the marbles to each bags? In the smallest amount.

Please show me the moves. Thanks!

You have 54 marbles, you cannot evenly distribute them into four bags. 54/4=13.5