To build a road, 600 meters were built in the first week, and the rest (2/7) was repaired in the second week. At this time, the number of completed and unrepaired roads is the same. How many meters are left after the first week of repairs?
修一条路，第一周修了600米，第二周修了剩下的(2/7)，这时修完和没有修的同样多．第一周修完后剩下多少米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">600 * (2/7)</gadget>
<output>1_200/7 = around 171.428571</output>

<gadget id="calculator">600 - (1_200/7) - (1_200/7)</gadget>
<output>1_800/7 = around 257.142857</output>

<gadget id="calculator">600 + (1_800/7)</gadget>
<output>6_000/7 = around 857.142857</output>

<gadget id="calculator">1 - (2/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(6_000/7) / (3/7)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 600</gadget>
<output>1_400</output>

<result>1_400</result>