6.2XX=41.6, 2X+1.3*4=6.8, 19.5/3X=2.
6.2X-X=41.6,2X+1.3*4=6.8,19.5/3X=2．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">19.5 / 6</gadget>
<output>3.25</output>

<result>3.25</result>