When a number is multiplied by 10, the number obtained is 72 more than the original number. What was the original number?
一个数乘10，得到的数比原来的数多72．原来的数是多少？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<result>8</result>