1,44 ... 4 (2n)-88 ... 8 (n) = 66 ... Paragraph 2 of Article 6

(You can write: 44...4-88 ...8 = 66 ...6 2 and then draw braces below and write 2n ...)

2. According to the above rule, n should be 1002 sixes, so the sum of each number is 1002*6=60 12.