To solve the equation \( u^3 = 216 \), we need to find \( u \) by taking the cube root of 216.
\[ u = \sqrt[3]{216} \]
\[ u = 6 \]
Therefore, the solution to the equation \( u^3 = 216 \) is \( u = 6 \).
solve u^3 = 216
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