rectangular parallelepiped frame with a length of 7 cm, a width of 6 cm, and a height of 5 cm is exactly made with a piece of wire. If this piece of wire is used to make a cube frame, what is the length of the sides of the cube in centimeters?
用一段铁丝正好做出一个长7厘米，宽6厘米，高5厘米的长方体框架．如果用这段铁丝做一个正方体框架，那么这个正方体的棱长是多少厘米？
<gadget id="calculator">7 + 6 + 5</gadget>
<output>18</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<result>6</result>