There are 200 gay men and 168 lesbians in the hospital, 316 of them have had physical examinations, and how many have not.
医院有男同志200人，女同志168人，已经检查身体的有316人，没有检查身体的有多少人．
<gadget id="calculator">168 - 316</gadget>
<output>-148</output>

<gadget id="calculator">200 + (-148)</gadget>
<output>52</output>

<result>52</result>