Решить уравнение 16 (7-4b) - 14 (4b+1) + 10 (8b-1) = 38

16 * (7 - 4 * b) - 14 * (4 * b + 1) + 10 * (8 * b - 1) = 38;

Разделим на 2.

16 * (7 - 4 * b) / 2 - 14/2 * (4 * b + 1) + 10/2 * (8 * b - 1) = 38/2;

8 * (7 - 4 * b) - 7 * (4 * b + 1) + 5 * (8 * b - 1) = 19;

8 * 7 - 8 * 4 * b - 7 * 4 * b - 7 * 1 + 5 * 8 * b - 5 * 1 = 19;

56 - 32 * b - 28 * b - 7 + 40 * b - 5 = 19;

(-32 * b - 28 * b + 40 * b) + (56 - 7 - 5) = 19;

b * (40 - 32 - 28) + (56 - 12) = 19;

b * (8 - 28) + 44 = 19;

b * (-20) + 44 = 19;

-20 * b + 44 = 19;

-20 * b = 19 - 44;

-20 * b = - 25;

20 * b = 25;

b = 25/20;

b = 5/4;

b = 1 1/4;

b = 1.25.