If the length of a rectangle increases by 2 meters, the area will increase by 12 square meters. If the length decreases by 2 meters, it becomes a square. What is the area of this rectangle in square meters?
一个长方形，如果长增加2米，面积就会增加12平方米，如果长减少2米，就成为一个正方形，这个长方形的面积是多少平方米？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<result>48</result>