Zhang Yu copied a 210-page manuscript, the number of pages copied is equal to twice the number of pages not copied, how many pages have been copied?
张宇抄一份210页的稿件，已抄页数等于没抄页数的2倍，已抄多少页？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">210 / 3</gadget>
<output>70</output>

<gadget id="calculator">210 - 70</gadget>
<output>140</output>

<result>140</result>