A road has been built for 15 kilometers, and the road that has not been repaired is 5 kilometers less than twice the length of the road that has been repaired. How many kilometers are left unrepaired?
修一条路，已修了15千米，没有修的比已修的2倍少5千米．还有多少千米没有修？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<result>25</result>