How much is it to combine 99-78=21 and 21/3=7 into one formula
将99-78=21和21/3=7，合并成一个算式是多少
<gadget id="calculator">99 - 78</gadget>
<output>21</output>

<gadget id="calculator">21 / 3</gadget>
<output>7</output>

<result>7</result>