For #22, you add the fractions in the parentheses first. Since they don’t have the same denominator, you find a common denominator by multiplying 3/4 by 3 and 5/3 by 4. This will give you 9/12 and 20/12. So you now add these two fractions together to get 29/12, which simplifies to 2 5/12. You now have -2/3 + 29/12. -2/3 can be changed to -8/12 by multiplying it by 4 so that they have common denominators. The equation is now -8/12 + 29/12 . Since -8/12 is a negative number, you subtract 8 from 29 to get 21/12. 21/12 can be simplified to 7/4 by diving it by 3. The answer for #22 is 7/4.