The given pattern involves a series of operations between diagonally opposite numbers within each block to derive a logical conclusion.

Let's analyze the logic in each part of the problem:

1. In the first block with \(5 + 7\) and \(2\), the operation is:
   • \(5 + 7 = 12\),
   • \(12 / 2 = 6\).
2. In the second block with \(18 \div 3 / 6\), the solution becomes:
   • \(18 \div 3 = 6\).
3. Now, apply similar logic for the missing pattern:
   • From the pattern given in the third block \(2 - 9 / 7\) (where the result wants us to predict backwards from the answer that fits with a mod of operations eventually producing \(7\) as mainly output):
     • Calculate values to project the correct solution within similar coherent operations ensuring final results tally.

After computing the probable and operation steps, the representing the missing pattern.

concludes logically with the existing block pattern to complete the computational arrangement showcasing all operations used in a congruent and symmetrical manner as per the initial parts.