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Find the term independent of x in the ex...

Find the term independent of `x` in the expansion off the following expression: `(x-1/(x^2))^(3n)`

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Given
` (x-frac{1}{x^{2}})^{3 n} `
`T_{r+1}=\ ^{3 n} C_{r} x^{3 n-r}(frac{-1}{x^{2}})^{r} `
`=(-1)^{r 33 n} C_{r} x^{3 n-r-2 r}`
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