To solve this equation, we first need to add the fractions within the parentheses:

3/16 + 39/80

To add these fractions, we need to find a common denominator. In this case, the common denominator is 80:

(35)/(165) + 39/80
15/80 + 39/80

Now that the fractions have a common denominator, we can add them:

15/80 + 39/80 = 54/80

Now, we can add this result to 31/80:

31/80 + 54/80 = 85/80

Therefore, the solution to the expression 31/80 + (3/16 + 39/80) is 85/80.