The temperature in Xinfeng on a certain day is 5°C, while the temperature in Beijing is -7°C at that time, how much is the temperature difference between the two cities?
某日信丰的气温是5℃，而当时北京的气温是-7℃，两城市气温相差多少．
<gadget id="calculator">5 - (-7)</gadget>
<output>12</output>

<result>12</result>