To build a water canal, 50% of the total length has been repaired in the first phase of the project, and 35% of the total length has been repaired in the second phase of the project, leaving 80 meters to be repaired. How many meters is the total length of this canal?
修一条水渠，第一期工程修了全长的50%，第二期工程修了全长的35%，还剩80米没有修，这条水渠全长多少米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">80 / (3/20)</gadget>
<output>1_600/3 = around 533.333333</output>

<result>1_600/3 = around 533.333333</result>