A piece of iron wire can be welded into a cube frame with a side length of 7 decimeters. Now it is welded into a cuboid with a width of 6 decimeters and a height of 5 decimeters. How many decimeters is the length of the cuboid?
用一根铁丝可以焊成一个棱长7分米正方体框架，现在把它焊成一个宽是6分米，高是5分米的长方体，长方体的长是多少分米？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">21 - 11</gadget>
<output>10</output>

<result>10</result>