Question

Срочно.....пжпжпжпжп.​

Answer 1

Ответ:

1.  х = -4

2.  х = -1

3. х = 9

4. х = 9

Пошаговое объяснение:

1. 21х + 45 = 17 + 14х

21х - 14х = 17 - 45

7х = -28      х = -28/7      х = -4

2. 3х - (10 - 9х) = 22х

3х - 10 + 9х = 22х

12х - 22х = 10

-10х = 10    х = 10/-10     х = -1

3. 8х + 3(7 - 2х) = 4х + 3

8х + 21 - 6х = 4х + 3

2х - 4х = 3 - 21

-2х = -18      х = -18/(-2)      х = 9

4. 5 + (7х - 12)/3 = х + 13  

5*3 + (7х - 12) = 3х + 13*3

15 + 7х - 12 = 3х + 39

7х - 3х = 39 - 15 + 12

4х = 36     х = 36/4      х = 9