Compose a Sum

Compose three numbers from the digits `1,2,3,4,5,6,7,8,9` such that one of them is the sum of the other two.
Each digit must be used exactly once.

Difficulty level (1 very easy - 10 very hard): 1

Topics:
Arithmetic Combinatorics -> Case Analysis / Checking Cases -> Processes / Procedures
Sources:
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