(-88/10)-(-39/14)-7/2-6/2=
С трюками

-12 18/35

Пошаговое объяснение:

1) -88/10 - (-39/14) = -88/10 + 39/14 = -1232/140 + 390/140 = -842/140 = -421/70

2) -421/70 - 7/2 = -421/70 - 245/70 = -666/70 = -333/35 = -9 18/35

3) -9 18/35 - 6/2 = -9 18/35 - 3 = -12 18/35