Xiaohua entered a manuscript, and there are 1400 words left after the entry (5/7). How many words are there in this manuscript?
小华录入一份稿件，录入了(5/7)后还剩1400字，这份稿件共有多少字？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1_400 / (2/7)</gadget>
<output>4_900</output>

<result>4_900</result>