Put a square iron block with a side length of 6 cm into a cuboid container filled with water, and the water overflows by 6 mL. It is known that the length of the cuboid container is 7cm, the width is 8cm, and the height is 12cm. How much is the original water height?
将一个棱长6cm的方体铁块放进一个盛有水的长方体容器内，水溢出6mL．已知长方体容器长7cm，宽8cm，高12cm，求原来水高多少？
<gadget id="calculator">6 * 6 * 6</gadget>
<output>216</output>

<gadget id="calculator">216 - 6</gadget>
<output>210</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">210 / 56</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">12 - (15/4)</gadget>
<output>33/4 = around 8.25</output>

<result>33/4 = around 8.25</result>