решите пожалуйста!
номера:1154,1156​

Ответ:

Пошаговое объяснение:

№1154

1) 9(x - 1) = x + 15

9x - 9 = x + 15

9x - x = 15 + 9

8x = 24

x = 3

2) (11x + 14) - (5x - 8) = 25

11x + 14 - 5x + 8 = 25

6x = 25 - 14 -8

6x = 3

x = 0.5

3)  12 - 4(x -  3) = 39 - 9x

12 - 4x + 12 = 39 - 9x

-4x + 9x = 39 - 12 -12

5x = 15

x = 3

4) 2(3x + 5) - 3(4x - 1) = 11.8

6x + 10 - 12x + 3 = 11.8

-6x = 11.8 - 10 -3

-6x = -1.2

x = 0.2

№1156

1) -7(2 - 3x) = 56

-14 + 21x = 56

14x = 56 + 14

14x = 70

x = 5

2) (5 + 7a) 15 = - 30

75 + 105a = -30

105a = -30 - 75

105a = -105

a =  -1