Решите уравнение (1,2x+6) + (12-0,3x) = -9 (2-6,1x) - (1,1x+6,4) = 10

Вычислим корни.

1) (1,2 * x + 6) + (12 - 0,3 * x) = - 9;

Раскроем скобки.

1.2 * x + 6 + 12 - 0.3 * x = - 9;

Приведем подобные.

(1,2 * x - 0.3 * x) + (6 + 12) = - 9;

x * (1.2 - 0.3) + 18 = - 9;

0.9 * x + 18 = - 9;

0.9 * x = - 9 - 18;

0.9 * x = - 27;

x = - 27/0.9;

x = - 30.

2) (2 - 6,1 * x) - (1,1 * x + 6,4) = 10;

2 - 6.1 * x - 1.1 * x - 6.4 = 10;

(-6.1 * x - 1.1 * x) + (2 - 6.4) = 10;

-7.2 * x - 4.4 = 10;

-7.2 * x = 10 + 4.4;

-7.2 * x = 14.4;

x = - 14.4/7.2;

x = - 2.