A project can be completed in 14 days by team A alone, 7 days by team B alone, and 6 days by team C alone. Now, after two teams B and C work together for 3 days, A will do the rest alone. How many days will it take to complete the task?
一项工程，甲单独做需14天完成，乙队单独做需7天完成，丙队单独做需要6天完成．现在乙、丙两队合做3天后，剩下的由甲单独做，还要多少天才能完成任务．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/7) + (1/6)</gadget>
<output>13/42 = around 0.309524</output>

<gadget id="calculator">(13/42) * 3</gadget>
<output>13/14 = around 0.928571</output>

<gadget id="calculator">1 - (13/14)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

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

<result>1</result>