The engineering team has built a road that is 9 kilometers long, and the remaining length is 3 kilometers longer than what has been repaired. How long is this road in kilometers?
工程队修一条公路，已经修了9千米，剩下的长度比已经修好的3倍还多3千米，这条公路长多少千米？
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">27 + 3</gadget>
<output>30</output>

<gadget id="calculator">9 + 30</gadget>
<output>39</output>

<result>39</result>