Subtract the sum of (1/3) and (1/9) from (5/6), what is the difference?
从(5/6)里减去(1/3)与(1/9)的和，差是多少？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/3) + (1/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/6) - (4/9)</gadget>
<output>7/18 = around 0.388889</output>

<result>7/18 = around 0.388889</result>