Dad goes to work at 8:00 in the morning, leaves work at 5:00 in the afternoon, and takes a 2-hour break at noon. How many hours does Dad work in a day?
爸爸上午8：00上班，下午5：00下班，中午休息2小时，爸爸一天的上班时间是多少小时．
<gadget id="calculator">12 - 8 - 2</gadget>
<output>2</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<result>7</result>