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

### Instruction:
John's pool is 5 feet deeper than 2 times Sarah’s pool. If John’s pool is 15 feet deep, how deep is Sarah’s pool?

### Response:
Let x be the number of feet in John’s pool
2*x + 5=15
2x=10
x=5
#### 5