9 + x = 0
x = -9
Hence 9 - 9 = 0
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any of the following numbers works ...12, 23, 34, 45, 56, 67, 78, 89,
The number is 4. The formula could be written as 9 + 8/x = 11. Then you solve for x.
-9 + 9 = 0 The equation can be written 9 - 9 = 0 The answer is 0 (zero)
9
18+x=27 calculate and your answer should be 9.