If one side of a square is reduced by 2 cm and the other side is increased (1/5), a rectangle is obtained, which has the same area as the original square. What is the length of the side of the square in centimeters?
把一个正方形的一条边减少2cm，另一边增加(1/5)，得到一个长方形，这与原来的正方形面积相等，那么正方形的边长是多少厘米？
<gadget id="calculator">2 + 10</gadget>
<output>12</output>

<result>12</result>