For a decimal, if the decimal point is moved one place to the right, the resulting number will increase by 69.84. What is the original number of this decimal?
一个小数，如果把小数点向右移动一位，所得的数比原来增加了69.84，这个小数原来是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">69.84 / 9</gadget>
<output>7.76</output>

<result>7.76</result>