$R_{a} = R[x]/(x)$ isomorphic to $R_{b} = R[x]/(x-1)$

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I am looking at the following two rings:

$R_{a} = R[x]/(x)$ and $R_{b} = R[x]/(x-1)$.

I was told that these two rings were isomorphic, but I don't see why. Is this due to the minimal polynomials?