x + 5 = 12. What is x?, 7, 17, 6, 8, n + 6 = 15. What is n?, 21, 10, 9, 6, 23 = a + 8. What is a?, 15, 8, 16, 31, k + 9 = 20. What is k?, 12, 9, 29, 11, 18 = m + 7. What is m?, 10, 11, 25, 7, p + 4 = 17. What is p?, 13, 21, 4, 14, 14 = y + 5. What is y?, 5, 9, 19, 10, s + 8 = 27. What is s?, 20, 35, 8, 19, 16 = t + 9. What is t?, 9, 25, 7, 8, c + 7 = 22. What is c?, 29, 16, 7, 15, d + 6 = 12. What is d?, 6, 18, 5, 7, r − 5 = 14. What is r?, 20, 19, 5, 9, 21 = h − 6. What is h?, 26, 6, 27, 15, q − 8 = 10. What is q?, 2, 20, 8, 18, 9 = w − 4. What is w?, 5, 13, 12, 4, g − 7 = 16. What is g?, 23, 7, 24, 9, 11 = b − 3. What is b?, 13, 3, 14, 8, f − 9 = 8. What is f?, 17, -1, 72, 9, 24 = z − 6. What is z?, 29, 30, 6, 18, v − 5 = 13. What is v?, 19, 5, 8, 18, u − 4 = 9. What is u?, 5, 4, 13, 14.

Exercise 1

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