There are 2,840 color TV sets in an electrical appliance shopping mall, 768 were sold in the first half of the year, and 1,232 were sold in the second half of the year. How many sets are left?
某电器商场有彩电2840台，上半年卖出768台，下半年卖出1232台，还剩多少台？
<gadget id="calculator">768 + 1_232</gadget>
<output>2_000</output>

<gadget id="calculator">2_840 - 2_000</gadget>
<output>840</output>

<result>840</result>