A rope can form a rectangle with a length of 13 cm and a width of 5 cm. If it is changed into a square, what is the side length of the square in cm? (column equation solution)
一根绳可围成一个长13厘米，宽5厘米的长方形，若改围成正方形，这个正方形的边长是多少厘米？(列方程解答)
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">26 + 10</gadget>
<output>36</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>