To build a road, the full length (2/7) was repaired in the first week, and the full length (1/3) was repaired in the second week. At this time, the repaired part was 100 meters more than half of the total length. The total length of this road How much rice?
修一条路，第一周修了全长的(2/7)，第二周修了全长的(1/3)，这时已修的部分比全长的一半多100米，这条路全长多少米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/3) - (1/2)</gadget>
<output>-1/6 = around -0.166667</output>

<gadget id="calculator">(2/7) + (-1/6)</gadget>
<output>5/42 = around 0.119048</output>

<gadget id="calculator">100 / (5/42)</gadget>
<output>840</output>

<result>840</result>