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

### Instruction:
 Agnes今年25岁，她的女儿简今年6岁。多少年后，Agnes的年龄将是Jane的两倍？


### Response:
 假设Agnes年龄是Jane年龄的两倍的年数为x
x年后，25+x = 2(6+x)
通过展开和整理方程，得到：x-2x = 12-25
进一步求解得：-x = -13
两边乘以-1得到 x = 13