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

### Instruction:
Alex has some new shirts. Joe has 3 more new shirts than Alex. Ben has eight more new shirts than Joe. If Ben has 15 new shirts, how many new shirts does Alex have?

### Response:
 โจมีเสื้อใหม่ 15-8=<<15-8=7>>7 ตัว
แอเล็กซ์มีเสื้อใหม่ 7-3=<<7-3=4>>4 ตัว