Xiaogang has some pencils. After using up 7 of them, there are 7 left. How many pencils did Xiaogang originally have?
小刚有一些铅笔，用去7支后，还剩下7支，小刚原来有多少支铅笔？
<gadget id="calculator">7 + 7</gadget>
<output>14</output>

<result>14</result>