(12-7.2)/(0.84/2.1)
(12-7.2)/(0.84/2.1)
<gadget id="calculator">12 - 7.2</gadget>
<output>4.8</output>

<gadget id="calculator">0.84 / 2.1</gadget>
<output>0.4</output>

<gadget id="calculator">4.8 / 0.4</gadget>
<output>12</output>

<result>12</result>