3 + (8/9) - у = (2 + 7/9)

First, we need to combine the fractions on both sides of the equation:

3 + (8/9) - у = (2 + 7/9)
3 + (8/9) - у = (2 + 7/9)
3 + (8/9) - у = (18/9 + 7/9)
3 + (8/9) - у = 25/9

Next, we need to combine the whole numbers on both sides of the equation:

3 + (8/9) - у = 25/9
(27/9) + (8/9) - у = 25/9
35/9 - у = 25/9

Now, we can isolate у by subtracting 35/9 from both sides:

35/9 - у = 25/9

Therefore, у = 10/9.