To subtract the mixed numbers, we first convert the mixed numbers to improper fractions.

12 2/5 = (512 + 2)/5 = 62/5
6 1/5 = (56 + 1)/5 = 31/5
7 3/4 = (4*7 + 3)/4 = 31/4

Now we can subtract:
(62/5 - 31/5) / 31/4
= 31/5 / 31/4
= 31/5 * 4/31
= 124/155

Therefore, the result of (12 2/5 - 6 1/5) divided by 7 3/4 is 124/155.