Subtract the same number from the numerator and denominator of (14/39) to get exactly (1/6). What is this number?
把(14/39)的分子和分母减去同一个数后正好约成(1/6)，这个数是多少？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 39</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">14 - (13/2)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(15/2) / (5/6)</gadget>
<output>9</output>

<result>9</result>