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#Oracle SQL 11.2, 49 bytes#
SELECT 1 FROM DUAL WHERE(:1+:2+:3)/2IN(:1,:2,:3);
Rewrite of @xnor solution, kudos to him.
#Oracle SQL 11.2, 7249 bytes#
SELECT 1 FROM DUAL WHERE GREATEST(:1,:2,:3)-LEAST(:1,1+:2,2+:3)IN/2IN(:1,:2,:3);
#Oracle SQL 11.2, 72 bytes#
SELECT 1 FROM DUAL WHERE GREATEST(:1,:2,:3)-LEAST(:1,:2,:3)IN(:1,:2,:3);
