Can anyone explain please,thank.the sum of 8numbers is x,and the sum of different set of nine numbers is 2x.the average of the smaller set of numbers is 1 more than the average of the larger set of numbers

Please use proper English with correct grammar and punctuation in your post.

It would make it so much easier to establish what your are trying to say.
Furthermore, is there a question such as, "Find x" ?

sum of 8 number is x
so the average of those 8 numbers is x/8

sum of 9 other numbers is 2x
so the average of those 9 numbers is 2x/9

".the average of the smaller set of numbers is 1 more than the average of the larger set of numbers"
---> x/8 = 2x/9 + 1
multiply by 72
9x = 16x + 72
-7x = 72
x = -72/7