13/2+(-25/3)= ?
11 13/3+(-14 9/13) = ?

13/2+(-25/3)=13/2-25/3=39/6-50/6=-11/611 13/3+(-14 9/13) =11 13/3-14 9/13=46/3-191/13=598/39-573/39==25/39