In order to welcome the establishment of a civilized city in the province, a road was widened in the Hubin New District, and 15% of the road was repaired on the first day. On the second day, it was repaired 300 meters less than the first day, leaving 75% of the road. How long is this road in meters?
为迎接省文明城市创建，湖滨新区拓宽一条公路，第一天修了15%，第二天比第一天少修了300米，还剩75%．这条公路全长多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/20) - (3/4)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/20) - (1/10)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">300 / (1/20)</gadget>
<output>6_000</output>

<result>6_000</result>