The sum of x multiplied by 30 plus 9 is 273, find the value of x.
x乘30加上9的和，积是273，求x的值．
<gadget id="calculator">30 + 9</gadget>
<output>39</output>

<gadget id="calculator">273 / 39</gadget>
<output>7</output>

<result>7</result>