A number is added, subtracted, and divided with itself, and the sum, difference, and quotient are added together. The sum is 8.6. What is this number?
一个数分别与它自己相加，相减，相除，其和、差、商再相加，和是8.6，这个数是多少？
<gadget id="calculator">8.6 - 1</gadget>
<output>7.6</output>

<gadget id="calculator">7.6 / 2</gadget>
<output>3.8</output>

<result>3.8</result>