To solve this expression, we need to find a common denominator for all the fractions involved. In this case, the common denominator is 20.78.

So, the expression becomes:

(13/20.78) + (11/5.2020) + (7/20.78) - (11/5.2020)

Now, let's simplify each fraction:

13/20.78 = 0.6269 (rounded to four decimal places)
11/5.2020 = 2.1140 (rounded to four decimal places)
7/20.78 = 0.3370 (rounded to four decimal places)
11/5.2020 = 2.1140 (rounded to four decimal places)

Now, substitute these values back into the expression:

0.6269 + 2.1140 + 0.3370 - 2.1140

Combine like terms:

0.6269 + 0.3370 = 0.9639

2.1140 - 2.1140 = 0

Now, substitute these values back into the expression:

0.9639 + 0 - 0 = 0.9639

Therefore, the simplified expression is 0.9639.