There is a residential building, each of which has subscribed to two different newspapers. The residential building has subscribed to three newspapers, including 34 copies of China TV News, 30 copies of Beijing Evening News, and 22 copies of reference news. Then subscribe to Beijing Evening News and Reference News How many news in total?
有一栋居民楼，每家都订了2份不同的报纸，该居民楼共订了三种报纸，其中，中国电视报34份，北京晚报30份，参考消息22份，那么订北京晚报和参考消息的共有多少家？
<gadget id="calculator">34 + 30 + 22</gadget>
<output>86</output>

<gadget id="calculator">86 / 2</gadget>
<output>43</output>

<gadget id="calculator">43 - 34</gadget>
<output>9</output>

<result>9</result>