A square frame with a side length of 9 cm is just welded with an iron wire. If this iron wire is welded into a rectangular parallelepiped frame with a length of 9 cm and a height of 7 cm, how many centimeters should its width be?
用一根铁丝刚好焊成一个棱长9厘米的正方体框架，如果用这根铁丝焊成一个长9厘米、高7厘米的长方体框架，它的宽应该是多少厘米？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<gadget id="calculator">27 - 16</gadget>
<output>11</output>

<result>11</result>