5x-0.8*10=3.19.
5x-0.8*10=3.19．
<gadget id="calculator">0.8 * 10</gadget>
<output>8</output>

<gadget id="calculator">3.19 + 8</gadget>
<output>11.19</output>

<gadget id="calculator">11.19 / 5</gadget>
<output>2.238</output>

<result>2.238</result>