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Because 13 is considered by some to be an unlucky number
Unlucky in most cultures.However in Judaism 13 is actually considered a lucky number. The age when a boy becomes a man.
13 ! (:
There are several combinations to this question:5 and 197 and 1711 and 13
7-(-13) also equals: 7+13. Because, if you look at it, you can see that -(- can look like a positive. This is because taking negative from a negative can be considered adding! Isn't this unique?