(29.7-(6.2+0.85)*3)/4.
(29.7-(6.2+0.85)*3)/4．
<gadget id="calculator">6.2 + 0.85</gadget>
<output>7.05</output>

<gadget id="calculator">7.05 * 3</gadget>
<output>21.15</output>

<gadget id="calculator">29.7 - 21.15</gadget>
<output>8.55</output>

<gadget id="calculator">8.55 / 4</gadget>
<output>2.1375</output>

<result>2.1375</result>