Answer:
10 Its and odd pattern but 10 makes the most sense.
Explanation:
From 12 to the next number, you subtract 2, so it becomes 10.
From 10 to the next number, you add 4, making it 14.
From 14 to the next number, you subtract 8, resulting in 6
It looks like in this pattern what you subtract you then add it DOUBLED and continue doing the same