Answer:
Algebraic equation. Missing N/Answer
1. 13 + 12 + n = 30. n=5
2. 15 - n = 9. n=6
3. 21 + n = 42. n=21
4. 20 × n - 2 = 18 n=1
5. n - 12 = 13. n=13
6. n - 6 = 45. n=51
Step-by-step explanation:
I am not sure in no. 6 sorry
