It depends on what functions and operations are permitted.
4! + 4 + 4/4 seems the simplest.
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4+4(4-4)
(4*4)-(4/4)
There are six fours in twenty-four.
fourteen take away four and then add a four and times by (2 times 4)
(4/.4)+4+4 or (44x.4)+.4