1) 2х - 3 = 7
2х = 7 + 3
2х = 10
х = 10/2
х = 5
2) 2(х + 3) + 5(х - 1) = 15
2х + 6 + 5х - 5 = 15
2х + 5х = 15 - 6 + 5
7х = 14
х = 14/7
х = 2
3) 5х - 10 = 15
5х = 15 + 10
5х = 25
х = 25/5
4) 3(х - 7) + 6(х - 2) = 57
3х - 21 + 6х - 12 = 57
3х + 6х = 57 + 21 + 12
9х = 90
х = 90/9
х = 10
5) 4(7 - х) + 8(3 + х) = 64
28 - 4х + 24 + 8х = 64
8х - 4х = 64 - 28 - 24
4х = 12
х = 12/4
х = 3
1) 2х - 3 = 7
2х = 7 + 3
2х = 10
х = 10/2
х = 5
2) 2(х + 3) + 5(х - 1) = 15
2х + 6 + 5х - 5 = 15
2х + 5х = 15 - 6 + 5
7х = 14
х = 14/7
х = 2
3) 5х - 10 = 15
5х = 15 + 10
5х = 25
х = 25/5
х = 5
4) 3(х - 7) + 6(х - 2) = 57
3х - 21 + 6х - 12 = 57
3х + 6х = 57 + 21 + 12
9х = 90
х = 90/9
х = 10
5) 4(7 - х) + 8(3 + х) = 64
28 - 4х + 24 + 8х = 64
8х - 4х = 64 - 28 - 24
4х = 12
х = 12/4
х = 3