2x + (-3y+12) x + (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) 8(-3+6y) - 9(3y-4) -2(2x+5y)+4(-y+3x)

Конечно, сейчас помогу упростить выражения!

Разбираемся:

1. 2x + (-3y + 12) = 2x - 3y + 12

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

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

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

5. -(x - y) = -x + y

6. -(a + b) = -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. 8(-3 + 6y) - 9(3y - 4) = -24 + 48y - 27y + 36 = 21y + 12

25. -2(2x + 5y) + 4(-y + 3x) = -4x - 10y - 4y + 12x = 8x - 14y

Вот и все! Если нужна еще помощь, обращайся!