There is a cuboid, if its height is increased by 2cm, it becomes a cube. The surface area of this cube increases by 80cm**2 compared with the original cuboid. Find the surface area of the original cuboid.
有一个长方体，如果它的高增加2cm，就变成了正方体，这个正方体的表面积比原来长方体增加了80cm**2，求原来长方体的表面积．
<gadget id="calculator">80 / 4 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 10 * 2</gadget>
<output>200</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 10 * 4</gadget>
<output>320</output>

<gadget id="calculator">200 + 320</gadget>
<output>520</output>

<result>520</result>