Determine the sum of all single-digit replacements for $n$ such that the number ${42{,}789{,}n37}$ is divisible by 3.
Question:
Determine the sum of all single-digit replacements for $n$ such that the number ${42{,}789{,}n37}$ is divisible by 3.
Answer:
Let's think step by step.

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Determine the sum of all single-digit replacements for $n$ such that the number ${42{,}789{,}n37}$ is divisible by 3.
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