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Anonymous
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Helmer Homenick ∙
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sum of 13 and -6 = 7
Wiki User
6 + 7 = 13(Sum means add)
When you add 8 and 5 the sum will be 13. On the other hand when you add 6 and 7 the sum will be 13. That's why it's equal to 13.
29.
13 + 7 = 20 13 - 7 = 6
13 and 6