A batch of goods was transported, and (3/7) of the goods were transported on the first day, exactly 18 tons, and (1/3) of the goods were transported on the second day, how many tons of goods are left undelivered?
运一批货物，第一天运走了这批货物的(3/7)，正好是18吨，第二天运走了这批货物的(1/3)，还剩多少吨货物没运？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">18 / (3/7)</gadget>
<output>42</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">42 * (1/3)</gadget>
<output>14</output>

<gadget id="calculator">42 - 14 - 18</gadget>
<output>10</output>

<result>10</result>