2х-16=0
2х=16
х=16/2
х=8
5х=210+12х
5х-12х=210
-7х=210
х=210/-7
х=-30
5x + 21 = 3x + 25
5x – 3x = 25 – 21
2x = 4
x = 2
17 – 3x + 7x = 31 – 2x + 10
– 3x + 7x + 2x = 10 + 31 – 17
6x = 24
x = 4
2х-16=0
2х=16
х=16/2
х=8
5х=210+12х
5х-12х=210
-7х=210
х=210/-7
х=-30
5x + 21 = 3x + 25
5x – 3x = 25 – 21
2x = 4
x = 2
17 – 3x + 7x = 31 – 2x + 10
– 3x + 7x + 2x = 10 + 31 – 17
6x = 24
x = 4