i'm not really sure what to do here

b+2/3=2

if you want to find b here is the answer:

b=2-2/3

b=4/3

You could subtract 2/3 from each side, and the statement [ b = 4/3 ] would mystically appear on the paper before your wondering eyes. If your mission had been to find the value of 'b', then you'd be done.