If you multiply me by 7, subtract 2 and then divide by 6, you get 9. what number i am?

Need on this geometry question. explain how you did it.

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

7+(3n++8) what is the answer to this?