Two identical cuboids fit together to form a cube. The surface area of the cube is 42 square decimeters. Now put the two cuboids back together to form a large cuboid. What is the surface area of the large cuboid?
两个完全一样的长方体正好拼成一个正方体，正方体的表面积是42平方分米，现把这两个长方体重新拼成-个大长方体，大长方体的表面积是多少平方分米．
<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) * 4</gadget>
<output>14</output>

<gadget id="calculator">14 + 14</gadget>
<output>28</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">(7/2) * 2</gadget>
<output>7</output>

<gadget id="calculator">56 - 7</gadget>
<output>49</output>

<result>49</result>