Adding (1/3) to a certain number is equal to the difference between (3/4) and (1/6), find a certain number.
某数加上(1/3)，与(3/4)和(1/6)的差相等，求某数．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/4) - (1/6) - (1/3)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>