Complete The Equation Puzzle - 21 FebruaryBelow, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?
5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____
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