A fraction plus its fractional unit equals 1, and subtracting its fractional unit equals (6/7). What is the fraction?
一个分数加上它的分数单位等于1，减去它的一个分数单位等于(6/7)，这个分数是多少．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 - (6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) / 2</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 - (1/14)</gadget>
<output>13/14 = around 0.928571</output>

<result>13/14 = around 0.928571</result>