There are 66 camphor trees in the campus, which is 4 fewer than twice the number of privet trees. How many privet trees are there in the campus?
校园里有香樟树66棵，比女贞棵数的2倍少4棵，校园里女贞有多少棵？
<gadget id="calculator">66 + 4</gadget>
<output>70</output>

<gadget id="calculator">70 / 2</gadget>
<output>35</output>

<result>35</result>