Ответ:

  1. 49 + x = 69
    x = 69 − 49
    x = 20

  2. x − 34 = 46
    x = 46 + 34
    x = 80

  3. 36 − x = 14
    x = 36 − 14
    x = 22

  4. 80 − x = 46
    x = 80 − 46
    x = 34

  5. x − 28 = 67
    x = 67 + 28
    x = 95

  6. x + 18 = 46
    x = 46 − 18
    x = 28

Ответ: x = 20; 80; 22; 34; 95; 28 соответственно.