answer these questions. ( find the variables)

1. n + 7 = 10
2. c - 2+ = 7
3. a x 3 = 15
4. a / 5 = 9
5. 9z + 2 = 38
6. 17 + 3n = 47
7. 7y - 7 = 21
8. 3x + 90 = 147
9. 26/ y + 3 = 16
10. 147 - 3x + 90