решить уравнения: -8x + 4(7 + 8x) = 4x + 7.

-7x + 9(2 + x) = -4x + 3.

-x + 4(7 - x) = -7x + 5.​

-8x + 4(7 + 8x) = 4x + 7.

-8x + 28 + 32x = 4x + 7

24x + 28 = 4x +7

20x = - 21

x = -1.05

-7x + 9(2 + x) = -4x + 3.

-7x + 18 +9x = -4x +3

2x + 18 = -4x + 3

6x = -15

x= -2.5

-x + 4(7 - x) = -7x + 5

-x + 28 -4x = -7x + 5

-5x + 28 = -7x + 5

2x = -23

x= - 11.5