Longteng New Village needs to build a canal, 12.5 kilometers have been built, and the rest is 7.5 meters shorter than the 1.8 times of the repaired. How many kilometers is the total length of this canal?
龙腾新村要修一条水渠，已经修了12.5千米，剩下的比修了的1.8倍少7.5米，这条水渠全长多少千米？
<gadget id="calculator">12.5 * 1.8</gadget>
<output>22.5</output>

<gadget id="calculator">7.5 / 1_000</gadget>
<output>0.0075</output>

<gadget id="calculator">22.5 - 0.0075</gadget>
<output>22.4925</output>

<gadget id="calculator">22.4925 + 12.5</gadget>
<output>34.9925</output>

<result>34.9925</result>