-9 + 9 = 0
The equation can be written 9 - 9 = 0
The answer is 0 (zero)
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The mixed number equivalent to 13 over 9 is 14/9
The sum is: 72+9 = 81
It is equivalent to 11x+9 when simplified
3 plus x = 9
-9 would be the same as -|9|.