Here is one set of solving equations:

(0! + 0! + 0!)! = 6
(1 + 1 + 1)! = 6
2 + 2 + 2 = 6
√(3 * 3) + 3 = 6
√4 + √4 + √4 = 6
(5 / 5) + 5 = 6
6 – 6 + 6 = 6
7 – (7 / 7) = 6
8 – √(√(8 + 8)) = 6
√(√(9 * 9)) + √9 = 6

I must admit thta I had to look up the factorial definition again … but it is true 0! = 1 . What is zero factorial?
Also see the youTube clip where I got it from. Quite amusing.