Assuming you have to use all 4 of the numbers:
(9 + 4 - 5) x 3 = 24
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((-5 - -2) - 3) x -4 = 24
5! / 4 - 2 * 3
It is: 5/24+3/4 = 23/24
Assuming I have to use all 4 numbers: 3 x 9 + 5 - 8 = 24
24 = (3³ + 5) - 8.