Question

Решите пожалуйста
=)

Answer 1

665.

- 6 (9 - 5х) = 9х + 9

- 54 + 30х = 9х + 9

30х - 9х = 54 + 9

21х = 63

х = 63/21

х = 3

666.

-3 (1 + 4х) = - 4х - 5

-3 - 12х= -4х - 5

-12х + 4х = -5 + 3

-8х = -2

х = 1/4

667.

-6( -5 - 7х) = -8х + 2

30 + 42х = -8х + 2

42х + 8х = 2 - 30

50х = - 28

х = - 28/50

х= - 14/25

668.

9 + 2(2х + 1) = 1

9+ 4х +2 = 1

4х = 1 - 9 - 2

4х = - 10

х = - 2 2/4

х = -2 1/2

669.

4 + 3( 10х + 7) = -5

4 + 30х + 21 = - 5

30х = - 5 - 4 - 21

30х = - 30

х = -1