The width of a rectangular vegetable field is 2 meters, which is 5 meters less than the length. What is the perimeter of the vegetable field in meters?
一块长方形菜地的宽是2米，比长少5米，这块菜地的周长是多少米？
<gadget id="calculator">2 + 5 + 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>