(2/3 - 3/4)

(5/8 + 2/3)

first lets do what is inside the parentheses (you must find a common denominator in this case 12.

(2/3 - 3/4) = (8/12 - 9/12) = -(1/12)

(5/8 + 2/3) = (15/24 + 16/24) = -(1/24)

So now we have:

-(1/12)

-(1/24)

the negatives cancel.

(1/12)

(1/24)

and we can cross multiply

1.....24....24

-- * -- = ---

12....1.....12

so the answer is 2