Two engineering teams, A and B, work together to complete a job in 7 days. After the two teams work together for 5 days, all the personnel of A’s engineering team and (1/5) of B’s engineering team’s personnel will be transferred to other construction sites. The next work was done by the people left by engineering team B, and it was just completed after another 6 days. So how many days will it take for engineering team A to complete the project alone?
甲、乙两个工程队合做一件工作，7天能完成，两队先合做5天后，甲工程队的全部人员和乙工程队人员的(1/5)，调到其他工地，剩下的工作由乙工程队留下的人做，又过了6天刚好完成．那么甲工程队单独完成这项工程要多少天？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) * 5</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/7) / 6 / (4/5)</gadget>
<output>5/84 = around 0.059524</output>

<gadget id="calculator">(1/7) - (5/84)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>