please check my answer

2/3x-24 less than/equal to 8 = x less than/equal to 12

the way you typed it ....

2/3x - 24 ≤ 8
2/3x ≤32
x ≤ 48

If you meant it any other way, you have to use brackets.
e.g.
2/(3x) - 24 or
2/(3x-24)