$$6 \times 9-2 \times { 3 }^{ 3 } +5 \times { 2 }^{ 3 } =$$
$40$
$$54-2\times 3^{3}+5\times 2^{3}$$
$$54-2\times 27+5\times 2^{3}$$
$$54-54+5\times 2^{3}$$
$$0+5\times 2^{3}$$
$$0+5\times 8$$
$$0+40$$
$$40$$
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$2^{3}\times 5$
