128*9-72,3.14*6.5+35*0.314,3x-21=2(x-8)
128*9-72,3.14*6.5+35*0.314,3x-21=2(x-8)
<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<gadget id="calculator">21 - 16</gadget>
<output>5</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<result>5</result>