Решите: 1) -9(-1+x)=x-10 2)-3(1+10x)=10x+3 3)9-2(3-4x)=-2x+1 4)9+2(3-4x)=3x-3 5)3(10-7x)-x=-3

1) - 9(- 1 + x) = x - 10;

9 - 9x = x - 10;

- 9x - x = - 10 - 9;

- 10x = - 19;

x = - 19 : (- 10);

x = 1.9.

2) - 3(1 + 10x) = 10x + 3;

- 3 - 3 * 10x = 10x + 3;

- 9 + 30x = 10x - 3;

30x - 10x = - 3 + 9;

20x = 6;

x = 6/20 = 3/10;

x = 0.3;

3) 9 - 2(3 - 4x) = - 2x + 1;

9 - 6 + 8x = - 2x + 1;

8x + 2x = 1 - 9 + 6;

10x = - 2;

x = - 2/10 = - 1/5;

x = - 0.2

4) 9 + 2(3 - 4x) = 3x - 3;

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

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

- 11x = - 18;

x = - 18 : (- 11);

x = 18/11

x = 1 7/11;

5) 3(10 - 7x) - x = - 3;

30 - 21x - x = - 3

- 22x = - 33;

x = 33/22 = 3/2;

x = 1.5