$$90 \div 3 [ 300 \div 3 \{ 7 + ( 18 - 15 ) \} ]$$
$30000$
$$30\times \frac{300}{3}\left(7+18-15\right)$$
$$30\times 100\left(7+18-15\right)$$
$$3000\left(7+18-15\right)$$
$$3000\left(25-15\right)$$
$$3000\times 10$$
$$30000$$
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$2^{4}\times 3\times 5^{4}$
