а) 5x+4=25-2x
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
6,5y – 4y = 3,4 + 15
2.5y = 18.4
y = 7.36
а) 5x+4=25-2x
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
6,5y – 4y = 3,4 + 15
2.5y = 18.4
y = 7.36