If a section of road is built, what has been repaired is unrepaired (1/8). If another 200 meters is repaired, what has been repaired is unrepaired (1/6). What is the total length of the road?
修一段公路，已修的是未修的(1/8)，若再修200米，则已修的是未修的(1/6)，则公路总共多长？
<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/7) - (1/9)</gadget>
<output>2/63 = around 0.031746</output>

<gadget id="calculator">200 / (2/63)</gadget>
<output>6_300</output>

<result>6_300</result>