In a cube-shaped water tank with a side length of 8 decimeters, put an iron block with a bottom area of 48 square decimeters. After the iron block is completely submerged in the water, the water level rises by 3 decimeters. What is the height of the iron block? ? (column equation solution)
在一个棱长是8分米的正方体形水箱中，放进一个底面积是48平方分米的铁块，铁块完全没入水中后，水面上升了3分米，铁块的高是多少分米？(列方程解答)
<result>4</result>