We can't solve this expression because we do not know what x and y are suppose to be equal to. Instead we can only simplify it. And in this case, it is very easy. Just combine like terms. This means if two terms have the same variable then you can add or subtract them together.
8x + 3y + 2x
The 8x and 2x terms are like terms. So we can add them together.
8x + 3y + 2x = 10x + 3y
So, 10x + 3y is the most simplified version of 8x + 3y + 2x.
I hope this helped you understand about simplifying expressions. If this answer confusing just drop me a DM explaining what is confusing.