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find the poles and zeros of the following transfer function H(z)=((z^-1)-(z^-2)-(6z^-3))/(1+(z^-1)+(z^-2))

find the poles and zeros of the following transfer function

H(z)=((z^-1)-(z^-2)-(6z^-3))/(1+(z^-1)+(z^-2))

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