Решите уравнения: - 5x-7=3x+13 3-4,9z = (-5,4) - 2,8z

Вычислим корни:

1) - 5 * x - 7 = 3 * x + 13;

-5 * x - 3 * x = 13 + 7;

x * (-5 - 3) = 20;

x * (-8) = 20;

-8 * x = 20;

8 * x = - 20;

-4 * 2 * x = 4 * 5;

-2 * x = 5;

x = - 5/2;

x = - 2.5;

Ответ: х = - 2,5.

2) 3 - 4,9 * z = (-5,4) - 2,8 * z;

3 - 4.9 * z = - 5.4 - 2.8 * z;

-4.9 * z + 2.8 * z = - 5.4 - 3;

4.9 * z - 2.8 * z = 5.4 + 3;

z * (4.9 - 2.8) = 8.4;

z * 2.1 = 8.4;

21 * z = 84;

z = 84/21;

z = 4;

Ответ: z = 4.