$$[\{60\div5\}^{2}-5]\cdot6+6$$
$840$
$$\left(12^{2}-5\right)\times 6+6$$
$$\left(144-5\right)\times 6+6$$
$$139\times 6+6$$
$$834+6$$
$$840$$
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$2^{3}\times 3\times 5\times 7$
