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Answer:
1. 7x = 42
2. x + 5 = 10
3. a/b = c or a ÷ b = c
4. b + 8 / 2 = 7 (this is 8 + b over 2)
5. 2x - 18 = 6
6. 3x + 9 = 25
7. x + 12 = n
8. x + 10 = 21
9. 16 ÷ x = 4
10. 48 ÷ x = n