Решите уравнение - 15x+31=-7+4x 7 (2+y) - 3y=5y-6 2 (4-9d) - (2d+3) = -8 (4-d) + 3 (1+2d)

Найдем корни уравнений:

1) - 15 * x + 31 = - 7 + 4 * x;

-15 * x - 4 * x = - 7 - 31;

15 * x + 4 * x = 31 + 7;

x * (15 + 4) = 36;

19 * x = 36;

x = 36/19.

2) 7 * (2 + y) - 3 * y = 5 * y - 6;

7 * 2 + 7 * y - 3 * y = 5 * y - 6;

14 + 4 * y = 5 * y - 6;

4 * y - 5 * y = - 6 - 14;

-y = - 21;

y = 21.

3) 2 * (4 - 9 * d) - (2 * d + 3) = - 8 * (4 - d) + 3 * (1 + 2 * d);

8 - 18 * d - 2 * d - 3 = - 32 + 8 * d + 3 + 6 * d;

-20 * d + 5 = 14 * d - 29;

-20 * d - 14 * d = - 29 - 5;

-34 * d = - 34;

34 * d = 34;

d = 34/34;

d = 1.