1. n - 4 = 12
2. n - 13 = 20
3. n + 9 = 25
4. n + 5 = 75
5. x + 6 = 13
6. n - 6 = 5
For 1 n = 16
For 2 n = 33
For 3 n = 16
For 4 n = 70
For 5 x = 7
For 6 n = 11
Hope that helps, :).
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