Ответ:

1)  4(x-6)=x-9

4x-24=x-9

3x=15

x=5

2)  6-3(x+1)=7-2x

6-3x+3=7-2x

-x=7-6-3

-x=-2

x=2

3)  (8x+3)-(10x+6)=9

8x+3-10x-6=9

-2x=9-3+6

-2x=12

x=-6

4) 3.5-x=8(x+2.8)

3.5-x=8x+22.4

7x=22.4-3.5

7x=18.9

x=2.7

Ответ:

1) 5

2) -4

3) -6

4) -2.1

5) -22

6) 4

Пошаговое объяснение:

1) 4(x -6) = x - 9;

 4x - 24 = x - 9;

4x - x = 24 - 9;

3x = 15;

x = 5

2) 6 - 3(x + 1) = 7 - 2x;

6 - 3x - 3 = 7 - 2x;

-3x + 2x = 7 - 6 + 3;

-x = 4;

x = -4;

3) (8x + 3) - (10x +6) = 9;

8x + 3 - 10x - 6 = 9;

8x - 10x = 9 -3 + 6;

-2x = 12;

x = -6;

4)3.5 - x = 8(x + 2.8);

3.5 - x = 8x + 22.4;

-x - 8x = 22.4 - 3.5;

-9x = 18.9;

x = -2.1;

5) 0.3(6 - 2y) = 4.5 - 0.7(y + 9);

1.8 - 0.6y = 4.5 -0.7y - 4.9;

0.7y - 0.6y = 4.5 - 4.9 - 1.8;

0.1y = -2.2;

y = -22;

6) (x - ) = x - 2

x - = x - 2;

x - x = - 2;

- x = - 2;

x = 4;