Hi!
First let's put the numbers from least to greatest.
(just put x anywhere)
3, 4, 5, 7, 9, 9, 12, x
So right now (excluding x) the range is 9. So x cannot be higher than 12 or lower than 3.
Just pick a number that is higher than 12, and lower than 3, and that's your answer (if that's what you're asking for)!
Hope this helps! :)
