On a certain day, the temperature is -2°C in the morning and 5°C at noon, what is the temperature difference between morning and noon?
某一天早上的气温是-2℃，中午气温是5℃，早上和中午的温差是多少℃．
<gadget id="calculator">5 - (-2)</gadget>
<output>7</output>

<result>7</result>