A cuboid stone has a volume of 64 cubic decimeters. It is known that the length of the stone is 8 decimeters and the width is 4 decimeters. How many decimeters is the height of the stone? (solution by equation)
一块长方体石料，体积是64立方分米，已知石料的长是8分米，宽是4分米．石料的高是多少分米？(用方程解)
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