Решить уравнение: 1) 2x-x-2/2=x/3-6 2) 0.69=5-2y/8*13.8 3) 1-y/7+y=y/2+3 4) 0.5*4+2x/13=x-10.

1) 2x-x-2/2=x/3-6;

2 * x - x - 1 = x / 3 - 6;

x - 1 = x / 3 - 6;

3 * x - 3 = x - 18;

3 * x - x = - 18 + 3;

2 * x = - 15;

x = - 15 / 2;

x = - 7.5;

2) 0.69=5-2y/8*13.8;

0.69 = 5 - 1 / 4 * y * 13.8;

0.69 = 5 - 3.45 * y;

3.45 * y = 5 - 0.69;

3.45 * y = 4.31;

3) 1-y/7+y=y/2+3;

14 - 2 * y + 14 * y = 7 * y + 3;

14 + 12 * y = 7 * y + 3;

12 * y - 7 * y = 3 - 14;

5 * y = - 11;

y = - 5.5;

4) 0.5*4+2x/13=x-10;

2 + 2 / 13 * x = x - 10;

26 + 2 * x = 13 * x - 130;

2 * x - 13 * x = - 130 - 26;

- 11 * x = - 156;

x = 156 / 11;

x =