-36+79-42+79=80
3,19-5,9-0,86=-3,57
2,4+(-5,36)-(-0,84)+(-3,24)=-5,36
-16,54+(-9,31)-11,27-(-23,38)=-13,74
5 3/7+(-2 1/3)-(-3 7/15)=38/7-7/3+52/15=570/105-245/105+364/105=
=689/105=6 59/105
3 5/9+(-2 1/4)-(-4 5/6)-5 2/3=32/9-9/4+29/6-17/3=
=128/36-81/36+174/36-204/36=17/36