Question: x t = 0 . 8 x t - 1 + a t + 0 . 4 a t - 1 using the previous ARMA

xt=0.8xt-1+at+0.4at-1
using the previous ARMA(1,1) macro is
x t = 0 . 8 x t - 1 + a t + 0 . 4 a t - 1 using

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