The shopping mall originally had 80 TV sets. 39 units were sold and 43 units were shipped. How many televisions are there now?
商场原有80台电视机．卖出39台，运来43台．现在有多少台电视机？
<gadget id="calculator">80 - 39</gadget>
<output>41</output>

<gadget id="calculator">41 + 43</gadget>
<output>84</output>

<result>84</result>