Krsavec -34/15+89/40=-272+267/120=
-5/120=-1/24
5/12-7/9=14-28/36=-14/36=
-7/18

svetazuna -2 4/15 + 2 9/40 = - 34/15 + 89/40 = - 272/120 + 267/120 = - 5/120 = - 1/24 ;
5/12 + (-7/9) = 5/12 - 7/9 = 15/36 - 28/36 = - 13/36