а)5х+4=25-2х
5x + 2x = 25 – 4
7x = 21
x = 3
б)2z-4=8-z
2z + z = 8 + 4
3z = 12
z = 4
в)6,5y-15-4y+3,4=2.5y-11.6
г)3x-35=7x-28
3x – 7x = – 28 + 35
-4x = 7
x = -1.75
а)5х+4=25-2х
5x + 2x = 25 – 4
7x = 21
x = 3
б)2z-4=8-z
2z + z = 8 + 4
3z = 12
z = 4
в)6,5y-15-4y+3,4=2.5y-11.6
г)3x-35=7x-28
3x – 7x = – 28 + 35
-4x = 7
x = -1.75