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zexius
That literally means the numbers '5' and '12' written like this: 5 + 12

represent the sum of 5 and 12, which is the same as 5 + 12 (because the sum is when all the numbers are added up).

So it's saying 5 + 12 equals to 17. 

Do you get it? 
Alyssa2412
The sum means answer of a addition problem and the answer of 5+12 and the sum of 5 and 12 are the same thing