$$18 - ( 27 ) \div [ ( - 4 ) - ( - 29 ) ]$$
$\frac{423}{25}=16.92$
$$18-\frac{27}{-4+29}$$
$$18-\frac{27}{25}$$
$$\frac{450}{25}-\frac{27}{25}$$
$$\frac{450-27}{25}$$
$$\frac{423}{25}$$
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$\frac{3 ^ {2} \cdot 47}{5 ^ {2}} = 16\frac{23}{25} = 16.92$