For a number, if its decimal point is moved one place to the left, the new number obtained is 6.3 less than the original number. What is the original number?
一个数，如果将它的小数点向左移动一位，那么所得的新数比原数少6.3，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">6.3 / 9</gadget>
<output>0.7</output>

<gadget id="calculator">0.7 * 10</gadget>
<output>7</output>

<result>7</result>