(-4 1/26+3 8/39)*2,3/5+(-7,4+6,3): 1,4/7 -2,125*(-4/5*2)-0,8*(-2 1/8)

       = - 2 5/6

1)   -4 1/26+3 8/39= - 4 3/78+3 16/78= - 81/78 - 16/78= - 65/78= - 5/6
2)   -5/6 * 2 3/5= - 5/6 * 13/5= - 13/6= - 2 1/6
3)   -7,4+6,3= - 1,1
4)   - 1,1:1 4/7= - 11/10 : 11/7= - 11/10 * 7/11= - 7/10
5)    -2 1/6+(-7/10)= - 2 5/30 - 21/30= - 2 25/30= - 2 5/6

.
        = -2

1)    - 4/5*2= - 8/5
2)    - 2,125 * (-8/5)=17/8 * 8/5=17/5=3 2/5
3)    0,8 * (-2 1/8= - 8/10 * 17/8= - 17/10
4)    17/5 * ( - 17/10)= - 2