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The z-transform of the signal$$x(n) = \begin{cases}1, & n = -1\\2, & n = 0 \\ -1, & n = 1 \\1, & n = 2 \\0, & otherwise \end{cases}$$
$$z + 2 - z^{-1} + z^{-2}$$
$$z^{-1} + 2 - z + z^2$$
$$z + 2z^2 - z^{-1} + z^{-2}$$
$$z + 2 - z^{+1} + z^{-2}$$
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