For a simple fraction, the numerator is equal to 1 after adding 1, and the numerator is equal to (5/6) after subtracting 1. What is the original fraction?
一个最简分数，分子加1后等于1，分子减1后等于(5/6)，原分数是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) / 2</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 - (1/12)</gadget>
<output>11/12 = around 0.916667</output>

<result>11/12 = around 0.916667</result>