(2/3) minus the sum of (1/4) and (1/8), what is the difference?
(2/3)减去(1/4)与(1/8)的和，差是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) + (1/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(2/3) - (3/8)</gadget>
<output>7/24 = around 0.291667</output>

<result>7/24 = around 0.291667</result>