За правильное решение, ещё по 15 пкт. №1. 7-3(х-1)=2х №2. 6(2х+0,5)=8х-(3х+4) №3. 10-х(5-(6+х))=х(х+3)-4х №4. 5х-2(х-3)=6х №5. 6х-(2х+5)=2(3х-6) №6. х(х(х-1))+6=х(х+3)(х-4) №7. 6-4(х+1)=3х №8 3(х-2)=7+(2х-5)

1) 7 - 3x - 3 = 2x

    4 = 5X

X = 4\5

2) 12X + 3 = 8x - 3x - 4

12x - 8x + 3x = - 4 - 3

7x = - 7

x = - 1

3) 10 - X( 5 - 6 - x) = x^2 + 3x - 4x

10 - 5x + 6X +x^2 = x^2 - x

10 + x +x^2 = x^2 - x

10 = - x - x^2 + x^2 - x

10 = - 2x

x = - 5

4) 

5x - 2x + 6 = 6X

3x - 6x = - 6

- 3x = - 6

x = 2

5) 6x - 2x - 5 = 6x - 12

4x - 6x = - 12 + 5

- 2x = - 7

x = 7/2 = 3.5

6) x(x^2 - x) + 6 = (x^2 + 3x)(x - 4)

x^3 - x^2 + 6 = x^3 - 4x^2 + 3x^2 - 12x

x^3 - x^2 - x^3 + x^2 + 12x = - 6

12x = - 6

x = - 0,5

7) 6 - 4x - 4 = 3x

- 4x - 3x = - 6 + 4

- 7x = - 2

x = 2\7

8) 3x - 6 = 7 + 2x - 5

3x - 2x = 6 + 7 - 5

x = 8