The road construction team built a road. On the first day, it built the full length (1/5) and 100 meters, and on the second day, it repaired the rest (2/7). At this time, there are still 500 meters of road left to be repaired. Question: How long is this road in meters?
筑路队修一条公路，第一天修了全长的(1/5)又100米，第二天又修了余下的(2/7)，这时还剩下500米路没有修．问：这条公路全长多少米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">500 / (5/7)</gadget>
<output>700</output>

<gadget id="calculator">700 + 100</gadget>
<output>800</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 / (4/5)</gadget>
<output>1_000</output>

<result>1_000</result>