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

### Instruction:
Carol has $60 and saves $9 per week. Mike has $90 and saves $3 per week. How many weeks before Carol and Mike both have the same amount of money?

### Response:
 กำหนดให้ x = จำนวนสัปดาห์
60 + 9x = 90 + 3x เพื่อที่จะทำให้เท่ากัน
9x = 30 + 3x
6x = 30
x = <<5=5>>5
ใน 5 สัปดาห์ พวกเขาจะมีเงินเท่ากัน.