If the decimal point of a certain number is moved one place to the right, the new number obtained is 7.2 more than the original number. What is the original number?
某数小数点向右移动一位，得到的新数比原来增加7.2，这个数原来是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>0.8</result>