(8 1/42-12 4/21)-(-5 1/3-3 3/7)

(8 1/42 – 12 4/21) – (– 5 1/3 – 3 3/7)

1) (337/42 – 256/21) – (– (5 1/3 + 3 3/7))

2) (– 25/6) – (– ((5 + 3) + (1/3 + 3/7)))

3) – 25/6 – (– (8 + 16/21))

4) – 25/6 – (– (– 8 16/21))

5) – 25/6 + 8 16/21

6) – 25/6 + 184/21

7) 193/42 = 4 25/42