I'm assuming the equation is x^3 = 216 or
(both mean the same thing)
If so, then the solution to x^3 = 216 is
x = 6
We can find this by taking the cube root of both sides
x^3 = 216
x = 216^(1/3) .... 1/3 power means cube root
x = 6
Checking the answer:
x^3 = 216
6^3 = 216
6*6*6 = 216
216 = 216
Answer is confirmed
So once again the answer is x = 6. This is assuming the initial assumption made at the top of the problem holds up.