There were originally 28 people on the bus, 8 people got off at the stop, and x people came up again, so there were 42 people in total at this time.
公共汽车原有28人，到站下去8人，又上来x人，这时共有42人．
<gadget id="calculator">42 - 28</gadget>
<output>14</output>

<gadget id="calculator">8 + 14</gadget>
<output>22</output>

<result>22</result>