The sum of 2 times a number and 3 is equal to the largest three-digit number. Find this number?
一个数的2倍与3的和等于最大的三位数，求这个数？
<gadget id="calculator">999 - 3</gadget>
<output>996</output>

<gadget id="calculator">996 / 2</gadget>
<output>498</output>

<result>498</result>