First, let's simplify each part of the equation:

(2,04 - 1 1/4) = 2,04 - 1,25 = 0,79

(7 4/13 - 4 4/13) = 7 - 4 = 3

(13 6/13 + 11 7/13) = 13 + 11 = 24

Now, let's substitute back into the equation:

0,79 : 1/20 + 3 : 0,15 - 4 : 24

0,79 : 1/20 = 0,79 * 20 = 15,8

3 : 0,15 = 3 / 0,15 = 20

4 : 24 = 1/6

Finally, substitute back into the equation:

15.8 + 20 - 1/6 = 35.8 - 0.16 = 35.64

Therefore, the final answer is 35.64.