А) 2х + 1 / 5 = 1
2х + 1 = 1 * 5
2х + 1 = 5
2х = 5 - 1
2х = 4
х = 2
б) 11 - 3х / 4 = 1 / 2
11 - 3х = 1/2 * 4
11 - 3х = 2
3х = 11 - 2
3х = 9
х = 3
в) 3х + 7 / 5 = 6х + 4 / 5
3х + 7 = 6х + 4
7 - 4 = 6х - 3х
3 = 3х
х = 1
г) 7х - 3 / 6 = 5х + 1 / 2
7х - 3 = 3 (5х + 1)
7х - 3 = 15х + 3
7х - 15х = 3 + 3
- 6х = 6
х = - 1