 
<translate> Ka o bụrụ ọnụọgụgụ akwụkwọ ochie na d bụ ọnụọgụgụ akwụkwọ ndị mebiri emebi. Anyị maara na o + d = 69 na o = 6d - 8. N'ịgbanwe ntụnyere nke mbụ n'ime ntụnyere nke abụọ, anyị na-enweta 6d - 8 + d = 69. Na ijikọta okwu ndị yiri ya, anyị na-enweta 7d - 8 = 69. Ị gbakwunye 8 n'akụkụ abụọ, anyị na-enweta 7d = 77. Ịkewaa akụkụ abụọ site na 7, anyị na-enweta d = 11. N'ihi ya, azịza ya bụ 11. <eng> Let o be the number of obsolete books and d be the number of damaged books. We know that o + d = 69 and o = 6d - 8. Substituting the first equation into the second equation, we get 6d - 8 + d = 69. Combining like terms, we get 7d - 8 = 69. Adding 8 to both sides, we get 7d = 77. Dividing both sides by 7, we get d = 11.
Therefore, the answer is 11. 