0
Anonymous
-9 + 11 = 2
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you need to add +9 +9-7 = +2
nine add 7 to get from -7 to 0 then add 2 to get to 2 7 + 2 = 9
9
- 8 + 17 = 9 =========
2/9 + 2/3 = 2/9 + 6/9 = 8/9