Question

помогите пожалуйста ​

Answer 1

Ответ:

Пошаговое объяснение:

-13 = 27 + 5x

5x = -13 - 27

5x = -40

x = -40:5

x = -8

68 - 2x = 6x + 4

6x + 2x = 68 - 4

8x = 64

x = 64 : 8

x = 8

7(7 - 4x) - 39 = 9x - 5(8x + 2)

49 - 28x - 39 = 9x - 40x - 10

10 - 28x = -31x - 10

31x - 28x = -10 - 10

3x = -20

x = -20 : 3

x = -6 2/3

4) (x-5)/4 - 7 = (2x-11)/3 (домножим на 12)

3(x - 5) - 7*12 = 4(2x - 11)

3x - 15 - 84 = 8x - 44

3x - 99 = 8x - 44

8x - 3x = -99 + 44

5x = -55

x = -55 : 5

x = -11