(80-9.8)*0.6-2.12．
(80-9.8)*0.6-2.12．
<gadget id="calculator">80 - 9.8</gadget>
<output>70.2</output>

<gadget id="calculator">70.2 * 0.6</gadget>
<output>42.12</output>

<gadget id="calculator">42.12 - 2.12</gadget>
<output>40</output>

<result>40</result>