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

### Instruction:
 Lidia ana mkusanyiko wa vitabu. Mkusanyiko wake ni mara nne zaidi ya mkusanyiko ambao rafiki yake Susan anao. Jumla Susan na Lidia, wote wawili wana vitabu 3000. Susan ana vitabu vingapi katika mkusanyiko wake?


### Response:
 Hebu x iwe idadi ya vitabu katika mkusanyiko wa Susan.
Mkusanyiko wa wote Susan na Lidia basi ungekuwa 4*x + x = 3000.
5*x = 3000
x = <<600=600>>600