(12+34)*56-789．
(12+34)*56-789．
<gadget id="calculator">12 + 34</gadget>
<output>46</output>

<gadget id="calculator">46 * 56</gadget>
<output>2_576</output>

<gadget id="calculator">2_576 - 789</gadget>
<output>1_787</output>

<result>1_787</result>