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(a,b,c)=>a+b==c||b+c==a||c+a==b=>a+b==c|b+c==a|c+a==b
Add 5 bytes if you need to name the function diff.
diff
Edit: Saved 2 bytes thanks to @Alex L.
(a,b,c)=>a+b==c||b+c==a||c+a==b
(a,b,c)=>a+b==c|b+c==a|c+a==b
