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

### Instruction:
The Reptile House at the zoo has 5 fewer animals than 3 times the number of animals housed in the Rain Forest exhibit. If the Reptile House has 16 animals, how many are in the Rain Forest exhibit?

### Response:
 กำหนดให้ x เป็นจำนวนสัตว์ในพิพิธภัณฑ์ป่าฝน
3x-5=16
3x=21
x=<<7=7>>7