A rectangle and a square have the same perimeter. The length of the rectangle is 9 decimeters and the width is 5 decimeters. How many decimeters is the side length of the square?
一个长方形和一个正方形周长相等，长方形的长是9分米，宽是5分米，这个正方形的边长的多少分米？
<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">14 * (1/2)</gadget>
<output>7</output>

<result>7</result>