(7/12)/(8/9)-(3/12)/(8/9).
(7/12)/(8/9)-(3/12)/(8/9)．
<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(7/12) / (8/9)</gadget>
<output>21/32 = around 0.65625</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / (8/9)</gadget>
<output>9/32 = around 0.28125</output>

<gadget id="calculator">(21/32) - (9/32)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>