There were 32 people in the car, 15 people got off the car, and 22 people got on the car. How many more people were there in the car than before?
车上原有32人，有15人下车，有22人上车，此时车上的人数跟刚才相比增加了几人？
<gadget id="calculator">32 - 15</gadget>
<output>17</output>

<gadget id="calculator">22 - 32</gadget>
<output>-10</output>

<gadget id="calculator">17 + (-10)</gadget>
<output>7</output>

<result>7</result>