The engineering team dug a canal. On the first day, the full length (3/8) was dug by 28 meters, and on the second day, the full length (4/7) was dug by 20 meters. At this time, the remaining 22 meters had not been dug. How long is this canal in meters?
工程队挖一条水渠，第一天挖了全长的(3/8)多28米，第二天挖了全长的(4/7)少20米，这时剩下22米没挖完．这条水渠全长多少米？
<gadget id="calculator">22 - 20</gadget>
<output>2</output>

<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (3/8) - (4/7)</gadget>
<output>3/56 = around 0.053571</output>

<gadget id="calculator">30 / (3/56)</gadget>
<output>560</output>

<result>560</result>