0.2*(12-(3.12+5.28)).
0.2*(12-(3.12+5.28))．
<gadget id="calculator">3.12 + 5.28</gadget>
<output>8.4</output>

<gadget id="calculator">12 - 8.4</gadget>
<output>3.6</output>

<gadget id="calculator">0.2 * 3.6</gadget>
<output>0.72</output>

<result>0.72</result>