If the number 7 is written on the right side of a number, the number will be increased by 7000, what is the number?
如果把数字7写在某数的右端，该数增加了7000，这个数是多少．
<gadget id="calculator">7_000 - 7</gadget>
<output>6_993</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">6_993 / 9</gadget>
<output>777</output>

<result>777</result>