If the side length of a square is reduced by 2 meters and the area is reduced by 16 square meters, what is the area of the original square?
如果一个正方形边长减少2米，面积减少16平方米，原来正方形面积为多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 2 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>