А)решите уравнение:(3x+5)+(8x+1)=17 б)19-5(3x-1)=9 в) 30+5(3x-1)=35x-25

(3x + 5) + (8x + 1) = 17;

3х + 5 + 8х + 1 = 17;

11х + 6 = 17;

11х=  17 - 6;

11х = 11;

х = 11 : 11;

х = 1;

(3 * 1 + 5) + (8 * 1 + 1) = 17;

(3 + 5) + (8 + 1) = 17;

8 + 9 = 17;

17 = 17.

19 - 5 * (3x - 1) = 9;

19 - 5 * 3х - 5 * (- 1) = 9;

19 - 15х + 5 = 9;

- 15х + 24 = 9;

- 15х = 9 - 24;

- 15х = - 15;

- х = - 15 : 15;

- х = - 1;

х = 1;

19 - 5 * (3 * 1 - 1) = 9;

19 - 5 * 2 = 9;

19 - 10 = 9;

9 = 9.

30 + 5 * (3x - 1) = 35x - 25;

30 + 5 * 3х - 5 * (- 1) = 35х - 25;

30 + 15х - 5 - 35х = - 25;

- 20х = - 25 - 30 + 5;

- 20х = - 55 + 5;

- 20х = - 50;

- х=  - 50 : 20;

- х = - 2,5;

х = 2,5;

30 + 5 * (3 * 2,5 - 1) = 35 * 2,5 - 25;

30 + 5 * 6,5 = 87,5 - 25;

30 + 32,5 = 62,5;

62,5 = 62,5.