3x - 4 < 8
4 is subtracting on the left, then it will add on the right
3x < 8 + 4
3x < 12
3 is multiplying on the left, then it will divide on the right
x < 12/3
x < 4
3/2 is less than 4, then it's on the solution set
4 is not less than 4, then it isn't on the solution set
4.5 is not less than 4, then it isn't on the solution set
2 is less than 4, then it's on the solution set
The correct options are 4 and 4.5
