To build a road, 35% of the total length has been built. If another 900 meters are built, the length of the repaired road will be the same as that of the unrepaired road. How long is this road in meters?
修一条路，已经修了全长的35%，如果再修900米，已修的和未修的一样长．这条路全长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">900 / (3/20)</gadget>
<output>6_000</output>

<result>6_000</result>