If the length of a cuboid is shortened by 3 cm, it becomes a cube. At this time, the surface area is reduced by 72 square centimeters. What is the volume of the original cuboid in cubic centimeters?
一个长方体，如果长缩短3厘米，就变成了一个正方体，这时的表面积比原来减少了72平方厘米，原来长方体的体积是多少立方厘米？
<gadget id="calculator">72 / 4 / 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">6 * 6 * 9</gadget>
<output>324</output>

<result>324</result>