When a farmer cuts a rice field, on the first day he cuts all (1/7) more than 2 mu, on the second day he cuts off the remaining (1/6) more than 2 mu, on the third day he cuts off the remaining (1/5) more 2 mu, and the rest took another 3 days to mow. As a result, the same amount was harvested every day. How many mu of paddy fields are there in total?
农民割稻田，第一天割了全部的(1/7)还多2亩，第二天割了余下的(1/6)多2亩，第三天割了余下的(1/5)多2亩，剩余的又用了3天割完，结果每天割的数量同样多，稻田一共有多少亩？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/6) - (1/7)</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">2 / (1/42)</gadget>
<output>84</output>

<result>84</result>