Решите уравнение 7x+10 (x-3,1) = 16x-3 (8-x)

7 * x + 10 * (x - 3,1) = 16 * x - 3 * (8 - x);

Раскроем скобки.

7 * x + 10 * x - 10 * 3.1 = 16 * x - 3 * 8 + 3 * x;

7 * x + 10 * x - 31 = 16 * x + 3 * x - 24;

x * (7 + 10) - 31 = x * (16 + 3) - 24;

x * 17 - 31 = 19 * x - 24;

17 * x - 31 = 19 * x - 24;

17 * x - 19 * x = - 24 + 31;

x * (17 - 19) = 31 - 24;

x * (-2) = 7;

-2 * x = 7;

x = - 7/2;

x = - 3.5;

Ответ: х = - 3,5.