1) 8(1-х)+4(х-2)=24; 2)14(х-5)-7(х+2)=-14; 3)1/2х=1/4(х-7)=х; 4)1/7-х+2/4=3-6х/28. прошу помогите голова вобще не варит

1) 8 * (1 - х) + 4 * (х - 2) = 24;
8 * 1 - 8 * x + 4 * x - 4 * 2 = 24;
8 - 8 * x + 4 * x - 8 = 24;
- 4 * x = 24;
x = 24/(- 4);
x = - 6.
2) 14 * (х - 5) - 7 * (х + 2) = - 14;
14 * x - 14 * 5 - 7 * x - 7 * 2 = - 14;
14 * x - 70 - 7 * x - 14 = - 14;
7 * x = 70;
x = 70/7;
x = 10.
3) 1/2 * х + 1/4 * (х - 7) = х;
x/2 + x/4 - 7/4 = x;
x/2 + x/4 - x = 7/4;
(2 * x)/4 + x/4 - (4 * x)/4 = 7/4;
(2 * x + x - 4 *x)/4 = 7/4;
- x/4 = 7/4;
x = - (4 * 7)/4;
x = - 7.
4) 1/7 - х + 2/4 = (3 - 6 * х)/28;
- x - (3 - 6 * х)/28 = - 1/7 - 2/4;
(- 28 * x - 3 + 6 * x)/28 = (- 1 * 4)/28 - (2 * 7)/28;
(- 22 * x - 3)/28 = - 4/28 - 14/28;
(- 22 * x - 3)/28 = (- 4 - 14)/28;
(- 22 * x - 3)/28 = - 18/28;
- 22 * x - 3 = (28 * (- 18))/28;
- 22 * x - 3 = - 18;
- 22 * x = - 18 + 3;
- 22 * x = - 15;
x = (- 15)/(- 22);
x = 15/22.