To build a road, the full length (2/5) was built on the first day, and 30% of the total length was repaired on the second day, leaving 750 kilometers to be repaired. How many kilometers is the road in total?
修一条路，第一天修了全长的(2/5)，第二天修了全长的30%，还剩750千米没有修，这条路一共长多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (2/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">750 / (3/10)</gadget>
<output>2_500</output>

<result>2_500</result>