9
-9
18. 9 x 0 = 0 S0, 9 + 0 + 9 = 18
It is: 9+0 = 9
the answer to 2+3+9+9+0=23 that is the professional way sio HA!!!!
9
127 easy math people
-9 + 9 = 0 The equation can be written 9 - 9 = 0 The answer is 0 (zero)
Is this a trick-question? 1+0+0+8=9
It is: -9
9 + (-9) = 9 - 9 = 0
It is 0.
These numbers all add up to 81.