Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Erin is sorting through the library books to decide which ones to replace. She finds 8 less than 6 times as many obsolete books as damaged books. If she removes 69 books total, how many books were damaged?

### Response:
 Hebu idadi ya vitabu vilivyoharibika iwe d.
Kisha idadi ya vitabu vilivyopitwa na wakati ni 6d - 8.
Idadi jumla ya vitabu vilivyondolewa ni d + (6d - 8) = 7d - 8 = 69.
Kwa kusuluhisha d tunapata d = 9.
Kulikuwa na vitabu 9 vilivyoharibika.