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nine add 7 to get from -7 to 0 then add 2 to get to 2 7 + 2 = 9
You need to add 7 (or +7)
You add 10 to -7 to get 3.
The inverse of add 7 is minus 7 Example: 20+7=27 to check do... 27-7=20
you need to add +9 +9-7 = +2