If one side of a square is reduced by 10% and the other side is increased by 2 meters, a rectangle is obtained. The area of this rectangle is equal to the area of the original square. What is the length of the side of the original square in meters?
一个正方形的一边减少10%，另一边增加2米，得到一个长方形，这个长方形的面积与原正方形的面积相等，原正方形的边长是多少米．
<gadget id="calculator">1.8 / 0.1</gadget>
<output>18</output>

<result>18</result>