number is first enlarged by 10 times and then reduced by 1000 times. The result is 78.6. What is the original number?
一个数先扩大10倍，再缩小1000倍，结果是78.6，这个数原来是多少．
<gadget id="calculator">1_000 / 10</gadget>
<output>100</output>

<gadget id="calculator">78.6 * 100</gadget>
<output>7_860</output>

<result>7_860</result>