x + (-3y + 12) +(12-x) y + (a - d) 2x - 16) + (4x + 12) (x - y) (а + в) (-c + d) - (-c-d) 8m - (7m - n) p - (-m + 8n - 9) 7c - (8c - 9n + 7r) - (16 + 8c) - (4c-8) 5(a + 2) 3(2 - m) 4(-x - y) 7(-c + d) -5(a + 2) -3(2 - m) -4(-x - y) -7(-c + d) 4(-x + 3y) - 3(x + 5y) -4(7d - m)+5(2d - 3m) 5(4c - 6) + 3(5-8c) 9(3y - 4)

Ответ: Решения представлены ниже

1. x + (-3y + 12) = x - 3y + 12

2. +(12-x) = 12 - x

3. y + (a - d) = y + a - d

4. (2x - 16) + (4x + 12) = 2x - 16 + 4x + 12 = 6x - 4

5. (x - y) = x - y

6. (а + в) = a + b

7. (-c + d) = -c + d

8. - (-c-d) = c + d

9. 8m - (7m - n) = 8m - 7m + n = m + n

10. p - (-m + 8n - 9) = p + m - 8n + 9

11. 7c - (8c - 9n + 7r) = 7c - 8c + 9n - 7r = -c + 9n - 7r

12. - (16 + 8c) - (4c-8) = -16 - 8c - 4c + 8 = -12c - 8

13. 5(a + 2) = 5a + 10

14. 3(2 - m) = 6 - 3m

15. 4(-x - y) = -4x - 4y

16. 7(-c + d) = -7c + 7d

17. -5(a + 2) = -5a - 10

18. -3(2 - m) = -6 + 3m

19. -4(-x - y) = 4x + 4y

20. -7(-c + d) = 7c - 7d

21. 4(-x + 3y) - 3(x + 5y) = -4x + 12y - 3x - 15y = -7x - 3y

22. -4(7d - m)+5(2d - 3m) = -28d + 4m + 10d - 15m = -18d - 11m

23. 5(4c - 6) + 3(5-8c) = 20c - 30 + 15 - 24c = -4c - 15

24. 9(3y - 4) = 27y - 36

Ответ: Решения представлены выше