If the decimal point of a number is moved one place to the right, it will be 7.2 larger than the original number. What is the original number?
一个数的小数点向右移动一位后比原数大7.2，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">7.2 / 9</gadget>
<output>0.8</output>

<result>0.8</result>