The perimeter of an equilateral triangle is equal to the perimeter of a rectangle whose length is 7 cm and width is 5 cm. What is the side length of this equilateral triangle?
一个等边三角形的周长与一个长7厘米，宽5厘米的长方形周长相等，这个等边三角形的边长是多少厘米？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<result>8</result>