Find the term independent of $x$ in the expansion of
$$\left(x - \frac 3 {x^2}\right)^{12}$$
Hint:
You have to solve in natural numbers the linear system \begin{cases}k-2\ell=0,\\k+\ell=12.\end{cases}
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Hint:
You have to solve in natural numbers the linear system \begin{cases}k-2\ell=0,\\k+\ell=12.\end{cases}