Step 1-Solve the parentheses first. You would subtract 6-5, and you would get 1/6.
Step 2-Multiply 2/3 and 1/6. For this, you don't need a common denominator or anything, that is for subtraction/addition. You multiply the top together, then the bottom, to get a final product of 2/18.
Step 3-Simplify. Reduce the fraction. In this case, you would divide by 2, to get 1/9.
Step 4-Have a great day!