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

### Instruction:
 一只吉娃娃犬、一只斗牛犬和一只大丹犬的总重为439磅。斗牛犬的重量是吉娃娃犬的3倍。大丹犬的重量比斗牛犬的三倍多10磅。大丹犬的重量是多少？


### Response:
 让x代表吉娃娃犬的重量
斗牛犬:3x
大丹犬:10+3(3x)=10+9x
总重:x+3x+10+9x=439
13x+10=439
13x=429
x=<<33=33>>33磅
大丹犬:10+9(33)=307磅