I don't know the equation
I will just solve several of them
\((9*9*9)/9/(9*6)\)
729/(9/54)
729/(1/6)
729*6 = 4374
or
(729/9)/54
(81/1)/54
81/54
9/6
3/2
\(9*(9*9)9/(9*6)\)
9*(81/9)/54
9*(9/1)/54
9*1/6
9/6
3/2
or
9*81/(9/54)
9*81/(1/6)
9*(81*6)
9*81*6 = 4374
There are other possibilities as well