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

### Instruction:
 梅根为一件原价22美元的衬衫支付了16美元。折扣金额是多少？


### Response:
 设x为折扣金额。
我们有，22 - x = 16美元
所以，22 - x + x = 16 + x
所以，22 = 16 + x
所以，22 - 16 = 16 + x - 16
所以，22 - 16 - x = 0
所以，-x = -6
所以，x = 6