(1-(7/12))x=2.4*(1/8).
(1-(7/12))x=2.4*(1/8)．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2.4 * (1/8)</gadget>
<output>0.3</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">0.3 / (5/12)</gadget>
<output>0.72</output>

<result>0.72</result>