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Okay... seeing how this question was posted 5 days ago... i would have to say that it is beeing used to answer a summer homework question, due to the fact that i also have that same question(however it has the fact that i can't use zero), i ended up here. There are infinitly many  answers because even if it is a negative number, it can still be even.

2+(-2)+20=20

4+10+6=20

(-1,000)+1,000+20=20

The negatives can cancle out the positve numbers
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