(4/7)*(1/4)+0.25*(3/7)-(1/4).
(4/7)*(1/4)+0.25*(3/7)-(1/4)．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">(4/7) * (1/4)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">0.25 * (3/7)</gadget>
<output>0.107143</output>

<gadget id="calculator">0.107143 - (1/4)</gadget>
<output>-0.142857</output>

<gadget id="calculator">(1/7) + (-0.142857)</gadget>
<output>0</output>

<result>0</result>