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17 - (-6) = 23
Therefore, the number you have to add to -6 to make 17 is 23.
You need to add 12.
6+17=23
17
You need to add 7 (or +7)
- 8 + 17 = 9 =========
You need to add 6 - (-9) = 6 + 9 = 15.
12
Add 11 -6 + 11 = 5
They all add up to 48