Решите уравнение, объясняя каждый шаг решения. 2 (x-4) = 115 (3-x) = 45 (x+1) = (x+3) = 5x + (x+2) + (x+4) = 7

Найдем корни.

1) 2 * (x - 4) = 11;

x - 4 = 11/2;

x - 4 = 5.5;

x = 5.5 + 4;

x = 9.5.

2) 5 * (3 - x) = 45;

3 - x = 45/3;

3 - x = 15;

-x = 15 - 3;

-x = 12;

x = - 12.

3) (x + 1) = (x + 3);

x + 1 = x + 3;

x - x = 3 - 1;

0 * x = 2;

Нет корней.

4) 5 * x + (x + 2) + (x + 4) = 7;

5 * x + x + 2 + x + 4 = 7;

6 * x + x + 6 = 7;

7 * x = 7 - 6;

7 * x = 1;

x = 1/7.