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

### Instruction:
 Dimbwi la John lina kina cha futi 5 zaidi ya mara mbili ya dimbwi la Sarah. Ikiwa dimbwi la John lina kina cha futi 15, kina cha dimbwi la Sarah ni kipi?


### Response:
 Hebu x iwe idadi ya futi katika dimbwi la John
2*x + 5=15
2x=10
x=<<5=5>>5