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Anonymous
subtract any number form nine and then with that answer and the number you subtracted 9 with, those added, make the sum of nine
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The sum of 19 and 9 is 28.
The sum of 14 and 9 is 23.
-23 is the sum of -32 and 9
135 is the sum
sum involves addition so the sum of 2 and 9 equals 2+9=11