(28+(172-88))*78．
(28+(172-88))*78．
<gadget id="calculator">172 - 88</gadget>
<output>84</output>

<gadget id="calculator">28 + 84</gadget>
<output>112</output>

<gadget id="calculator">112 * 78</gadget>
<output>8_736</output>

<result>8_736</result>