(X+5.6)*(1/4)=2.5.
(X+5.6)*(1/4)=2.5．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5.6 * (1/4)</gadget>
<output>1.4</output>

<gadget id="calculator">2.5 - 1.4</gadget>
<output>1.1</output>

<gadget id="calculator">1.1 / (1/4)</gadget>
<output>4.4</output>

<result>4.4</result>