Rizhao Village repaired flood embankments, 35% of the total length was repaired in the first week, and 3,600 meters were repaired in the second week. At this time, the total number of meters repaired in two weeks was still 400 meters away from the total length (3/4). How long is this embankment?
日照村修防洪堤，第一周修了全长的35%，第二周修了3600米，这时两周修的总米数距全长的(3/4)还有400米．这条防洪堤长多少米？
<gadget id="calculator">3_600 + 400</gadget>
<output>4_000</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(3/4) - (7/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4_000 / (2/5)</gadget>
<output>10_000</output>

<result>10_000</result>