5*2.4+3x=25.5．
5*2.4+3x=25.5．
<gadget id="calculator">5 * 2.4</gadget>
<output>12</output>

<gadget id="calculator">25.5 - 12</gadget>
<output>13.5</output>

<gadget id="calculator">13.5 / 3</gadget>
<output>4.5</output>

<result>4.5</result>