1)
1/2x + 3/4 = 7/16 - 5/8
8/16x + 12/16 = 7/16 - 10/16
8x + 12 = 7 - 10
8x = - 3 - 12
X = - 15/8
X = - 1 7/8
2)
7/18 - 3/4x = 5/6x + 4/9
14/36 - 27/36x = 30/36x + 16/36
14 - 27x = 30x + 16
57x = - 2
X = - 2/57
3)
Смотри решение 1)
4)
2/3 - 1/6х = 7/12х + 5/9
24/36 - 6/36х = 21/36х + 20/36
24 - 6х = 21х + 20
21х + 6х = 24 - 20
27х = 4
Х = 4/27