Crazy 8s

Logic Level 2

\[ \large{\begin{array}{cccc} &8& F & 8&D\\ + && 8 &D &R\\ \hline & 8& G & R&8\\ \hline \end{array}} \]

If \(D,\) \(F,\) \(G,\) and \(R\) are distinct digits satisfying the cryptogram above, and all "8" digits are already shown, what must \(R\) be?

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