$$45 - 16 + 28 \div 4 \times 9 \div 3$$
$50$
$$29+\frac{\frac{28}{4}\times 9}{3}$$
$$29+\frac{7\times 9}{3}$$
$$29+\frac{63}{3}$$
$$29+21$$
$$50$$
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$2\times 5^{2}$
