If adding 2 meters to the width of a rectangle with a perimeter of 24 meters yields exactly a square, what is the area of the original rectangle in square meters?
如果给周长为24米的长方形宽增加2米就恰好可以得到一个正方形，那么原来长方形的面积为多少平方米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">24 + 4</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<result>35</result>