2x - 33 = 35 : 33
2x - 33 = 35-3
2x - 33 = 32
2x - 33 = 9
2x = 9 + 33
2x = 42
x = 42 : 2
x = 21
2x - 33 = 35 : 33
2x - 33 = 9
2x = 9 + 33
2x = 42
x = 42 : 2
x = 21
2x - 33 = 35 : 33
2x - 33 = 32
2x - 33 = 9
2x = 9 + 33
2x = 42
x = 42 : 2
x = 21
vậy x = 21